Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8779042a9f2a6e3…

MALICIOUS

PDF

89.8 KB Created: 2021-05-23 22:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4c1c2a77f0182a5494830959ca991193 SHA-1: 86158435092d1c02474fbfe675e1e78abc705a90 SHA-256: d8779042a9f2a6e382c91ec4cc8fb0455275187beb1a2150b31e6304e5aa1c32
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, specifically designed to trick users into downloading further content. The presence of an external URI pointing to a redirector, coupled with a heuristic identifying a link farm, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this assessment, indicating the file is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=netflix+mod+apk+2020+pc PDF link annotation
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/japagegiwakal-jutometizi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fee12ea0bb1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388279/normal_6002db4cd4d2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fe39ed6cd2e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404975/normal_6004f31371788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5ff60e12c0a4a.pdfIn PDF document text
    • https://feredelulewijun.weebly.com/uploads/1/3/2/6/132681536/2225438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_601ae9c7ad6c1.pdfIn PDF document text
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/luboxojuduv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_606a95034e077.pdfIn PDF document text
    • https://gemikomumupoj.weebly.com/uploads/1/3/4/3/134393585/4762768.pdfIn PDF document text
    • https://bosofivi.weebly.com/uploads/1/3/4/6/134668799/8909983.pdfIn PDF document text
    • https://labufixurugon.weebly.com/uploads/1/3/4/8/134873424/serijadugodumukiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_6039b1691016c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/56965faa-26b2-47eb-a344-001af8db1a73/dorakasorojax.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/nalekulubazotizapalapad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a21239-b564-4d19-b594-1b207f242bcd/trauma_informed_cognitive_behavioral_therapy_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/vikotox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7c3b39-36b0-4182-a3b0-9fdd880c1f64/who_originally_sang_behind_closed_doors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c111e0-04a6-413d-9e4c-f3e2ab0cf420/vaviduvunaguxolabomut.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/23760692041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf13ede-cb58-4e62-8d04-8d4532af31c7/97628174956.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/menavogu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5084 bytes
SHA-256: d5c5f7253a1cb2722a464792b44ca4aad0c82ee407aac345ffc4171ccfd2fbd3
font_01_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 2920 bytes
SHA-256: eff84d7eb97eac7661ae2452e2199bf4d29eb5583fe5e911e211a65b47743a3b
font_02_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 11212 bytes
SHA-256: d12713a79668a8ae21c92acb535542450b6c9d773f233aecd5e1dcb140415409
font_03_sfnt_off000132cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CB 16720 bytes
SHA-256: e2a9c81e5336f2cf7624f6a08a939f4eed21b86ed89778ed89eb17ac4be11dad
font_04_sfnt_off0001494e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e