Malicious PDF — malware analysis report

Static analysis result for SHA-256 147588bcdd5f0683…

MALICIOUS

PDF

79.3 KB Created: 2021-05-30 00:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b89c9d3c5280ece7169b178efc344f1 SHA-1: 55cb39bfba721ee4ff110aa3037c7c74429a57d1 SHA-256: 147588bcdd5f0683a4e01cfc48d4684f2b3d3852c9aa3e7fe5da3548d085c8ae
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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.
  • 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://resalured.ru/strik?utm_term=five+nights+at+freddy%2527s+3+2.0+mod+apk PDF link annotation
    • https://zorazuzibenad.weebly.com/uploads/1/3/4/6/134617736/7917824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_600b72f0805f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_602b22c76ff6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5fff072396f25.pdfIn PDF document text
    • https://fatofexar.weebly.com/uploads/1/3/4/6/134687548/zodelet.pdfIn PDF document text
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/kewerowelijufi.pdfIn PDF document text
    • https://leborulixa.weebly.com/uploads/1/3/4/5/134503619/5020217.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/6138545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_60498005657bc.pdfIn PDF document text
    • https://tazaliraku.weebly.com/uploads/1/3/4/8/134884946/wufatem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446762/normal_60159bbd901ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5fcebd221e5d7.pdfIn PDF document text
    • https://woloxujujesif.weebly.com/uploads/1/3/4/7/134716607/1979970.pdfIn PDF document text
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/314a82dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_60158d38410b2.pdfIn PDF document text
    • https://nedisixikimu.weebly.com/uploads/1/3/7/5/137511189/kilebaka.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/e06a8a45-ba50-4bb8-a2e1-63c5541052ca/xexotawudaxizagekexesulib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dbc0846-fab0-4797-a478-73bd1cde3206/28124986388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d52eb8a-09e2-404b-a60e-b3a9216e95de/wesefutebap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36e3674-7077-458a-94ca-c08307fd23f8/82848725011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1e2e68-0504-46dc-a3bb-50168b5690f2/64970152973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbbed6c-6647-480e-93ad-254b822672a8/ruvoxujumojoxow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f27c633-3d1c-4c68-83bd-ee812fbddfce/bizirepokenugiremadelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9d44f1-6cf0-43d6-a78e-87216a8ab32a/13203483617.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 6108 bytes
SHA-256: bc2d06300b4a993fa195ce5b8e81bba3f5000b3afe7f2013b2d6b6836418f0f4
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 2904 bytes
SHA-256: 9ee7db78a680e954fc83827cb3b0ef6d483254f0c29ad6cde1ee3630ce45ecab
font_02_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10784 bytes
SHA-256: a5b159346f85b8e5a1bad53895e23aa42a3fc53ae37b089d67823d2fc48c14c7