Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c9f7e09b0f09f3…

MALICIOUS

PDF

74.8 KB Created: 2021-05-28 16:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1a4f8ed23563fa4a6cf4eb856366a95f SHA-1: c27cb1f4d823b15c4930dba8fd94f745ae7ac84b SHA-256: e5c9f7e09b0f09f38b186f88a5039c8875a195fae8f4698647e97416935ea092
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, many hosted on disposable domains, forming a link farm. The document body, though heavily obfuscated, appears to be a lure related to depression, likely intended to drive traffic to the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=what+is+the+word+depression+mean PDF link annotation
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/puvefomige-purisepe.pdfIn PDF document text
    • https://nonuradijo.weebly.com/uploads/1/3/1/4/131406562/rajelubisab.pdfIn PDF document text
    • https://pufigisefabu.weebly.com/uploads/1/3/4/3/134351441/parab.pdfIn PDF document text
    • https://vidufatow.weebly.com/uploads/1/3/1/4/131438098/52d5ed8.pdfIn PDF document text
    • https://numevajuga.weebly.com/uploads/1/3/0/9/130969633/c7ba5a32.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/0a2b91deabe1a.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/ac8c178891ff.pdfIn PDF document text
    • https://penelusoluko.weebly.com/uploads/1/3/4/6/134699361/berakukosewuzawikewo.pdfIn PDF document text
    • https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/sufuzuf.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/7c55536f3.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/wemod.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/rowut_napukilos.pdfIn PDF document text
    • https://tavimemake.weebly.com/uploads/1/3/7/5/137513296/zuzewejovazomom_retiwepafifapu.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/1afd0d24b28573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdfa0ed-2512-465b-863b-ef9c08074dfb/aptoide_tv_5.0.3_download_apk_for_android_-_aptoide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afae8446-6e51-4990-a3f0-adf5a6d7e875/dafajifaregi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e348d22d-a4f5-4eec-bd2d-45841a9a4c1c/maxtor_one_touch_160gb_external_hard_drive_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e84817a-cf69-48d4-aac4-5dfb205dc0ca/flotec_2_hp_sprinkler_pump_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcda8088-3e82-44a7-a782-a007f660a315/92995086492.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 5272 bytes
SHA-256: c7a42e9bdbabd11fe27cfb5bfce72236fc460f0a50d533efb53a9a32a29f4899
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10356 bytes
SHA-256: 5e3a6421f7efdf656d5b9cbd3f4b8e88551452a4d2f920d30224bc7d05c56213

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