Malicious PDF — malware analysis report

Static analysis result for SHA-256 7776d38b9894506c…

MALICIOUS

PDF

67.5 KB Created: 2021-03-13 16:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f26f2d4cde60fe52606f82589879497d SHA-1: 0c5902270aaf9906754436e6e2e67259925ad0c9 SHA-256: 7776d38b9894506c0d9855758e62024f680170a8db5a4b92618000c0d33dd69b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs point to various domains, some of which are hosted on disposable or less reputable platforms, further supporting a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/wix?keyword=polished+cotton+fabric+by+the+yard PDF link annotation
    • https://cdn.sqhk.co/ribuwikoli/gg76ij4/album_song_new_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/iihcWgg/why_put_hashtags_on_facebook_posts.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/heJbjcc/lopexedaponotixepaxebetad.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/xerizirowu_maxigivurep.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/2468e40b5fb.pdfIn PDF document text
    • http://abwaab.su/jozotapodivunarizr4i7w.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/Pjbibjj/milefafinu.pdfIn PDF document text
    • http://jolaxamitagifa.iblogger.org/risovunazevumuki.pdfIn PDF document text
    • https://kotedakivon.weebly.com/uploads/1/3/1/6/131637811/kawomif.pdfIn PDF document text
    • http://sodalabs.pro/duruwex4953k.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/Bhj3kij/79201082458.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegizeso/RghIodl/alien_shooter_android_game_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/fjehiew/tnpsc_departmental_exam_answer_key_2017.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/c3483715dae.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/3514703.pdfIn PDF document text
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/a32482c8081.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/8eea46.pdfIn PDF document text
    • https://pekixozere.weebly.com/uploads/1/3/5/3/135397988/73826e8.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/LBib6Fr/http_canon._com_ijsetup_mg3600.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/jigg2hd/xibilisuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixasudasiwub.epizy.com/consumer_reports_magazine_cars.pdfIn PDF document text
    • http://xipakugamuweren.rf.gd/aged_pension_application_form.pdfIn PDF document text
    • http://sebiwafexudezo.rf.gd/google_local_guide_level_6_benefits.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_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 5352 bytes
SHA-256: 696e0a75d6889b986aab1c05e43fad2b714bdcffa616b347d31eca5ef6260004
font_01_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 10156 bytes
SHA-256: 84b6a5ada28d032c57023d16c427e1f4759ea9ec51a2dbb5e7de78fcd69fb9a7

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