Malicious PDF — malware analysis report

Static analysis result for SHA-256 379d4f0b1fae4488…

MALICIOUS

PDF

74.7 KB Created: 2021-04-16 20:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e980bbc49cc731f811fe6f5be8b2b681 SHA-1: 2b7c0261c5719b48fa0271dea90134cfa211a03c SHA-256: 379d4f0b1fae4488799cbc476c3ca02c3d149b4fab0c672b1d232f8efd3d6254
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=garmin+vivosmart+4+charging+issues PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412403/normal_605248aaafc80.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/cd6602.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/Leiiztg/duwizugemalokoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_601cf00870e8b.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/4ghijjf/ringtone_apple_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_602167804cf5f.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/si4ghjT/20196870428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_5fd77b75a1088.pdfIn PDF document text
    • https://cdn.sqhk.co/sixatowitur/gNRGYIy/car_driving_games_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/fDm8hcb/14708356612.pdfIn PDF document text
    • https://zatagigozot.weebly.com/uploads/1/3/0/7/130775916/7704376.pdfIn PDF document text
    • https://filikegepux.weebly.com/uploads/1/3/5/3/135346592/wanilelesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fede9c139755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_60051e5ee9f30.pdfIn PDF document text
    • https://kebopudej.weebly.com/uploads/1/3/5/2/135298692/vesovopa.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/92399385ba6fb6e.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/nufiginemaw_mekupuzed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_6033c790483bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_6036226b3a39f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_93835ccb5e5d486192e7d2657ba99da5.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_fe448da3968047bf9eb899dd911124db.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_1a478f45dba14f4ab4a0d8eab6d71145.pdf?index=trueIn 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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 5360 bytes
SHA-256: 55814e7c6819c8dd6662e37040491b5dceb0ba32f3b78a8a13f601c3fabd6bad
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10772 bytes
SHA-256: d3e7706f7dd617902194b83ab789205a22bf6d8eba133a4c1be76516c49e58bd

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