Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d71d1b6fe1b1a4…

MALICIOUS

PDF

99.8 KB Created: 2021-03-29 23:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c8a4af5e878dedb06aee879e08305510 SHA-1: a85e61c967894c9c5a46ef84ca823d98e4c21305 SHA-256: c1d71d1b6fe1b1a41cfaefb991b1437d3da2fc69b3d0b5a298ca3b1a40497c38
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosting services, indicative of a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm structure suggest an attempt to manipulate search engine results or distribute malicious payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=should+i+share+my+ice+cream+ebook PDF link annotation
    • https://cdn.sqhk.co/sadopore/hbjeji2/waxixobug.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/memagubopez.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/hkhaMxW/offline_video_games_download.pdfIn PDF document text
    • http://differencecheats.net/nisemufigjt3sm.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/946c8e2.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/pawunezileguxiloxivi.pdfIn PDF document text
    • https://cdn.sqhk.co/salavogi/jj1rWzS/25596598746.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/2074033.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/xajibizipuxeke.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/kolunepibetenezonimi.pdfIn PDF document text
    • http://trells.space/dagajizaq10pp.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/heLhh72/guided_meditation_to_enhance_creativity.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/b63509c8-de03-4284-97f6-a1cef4ce34db/pimumetamefirusuvoveguk.pdfIn PDF document text
    • http://ganiwozipowure.epizy.com/lemuluzedet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47276f3b-ecc6-4217-8001-ac84bd7ccc13/how_to_fix_a_missing_or_failed_printhead.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/pci_syllabus_b._pharmacy_2020_19.pdfIn PDF document text
    • http://nilezowavegat.rf.gd/10763349937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6cb0df-b78b-4416-86d0-f9848537e978/how_to_build_a_web_application_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7911f9bd-802c-4fc7-a6bb-c48dc776c6ab/kobok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3e8679-d227-495b-9285-8fc34bebf5a9/zutozelejomufokijij.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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 29684 bytes
SHA-256: 3999daaec272cb0cf7795066d4fd1a2a250338c4c798dc51ad6e8072a6830231
font_01_sfnt_off000146eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EB 5588 bytes
SHA-256: eaf951950011de7ecb8fd4d650d54e63ff28a1c2e0c8fbad430fcbccb46b8691
font_02_sfnt_off000159c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C2 11840 bytes
SHA-256: d07e2d4c0e1c0ce6cfe2a007139fea1318065303db404917293ab0b6b2fcf7b7

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