Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8c7c5727ed1142…

MALICIOUS

PDF

84.9 KB Created: 2021-03-10 02:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d676a25bb74afb8a698c86988774606f SHA-1: 9d7d1bf1309e5bfc5d3cc06d210822d6b9c534c9 SHA-256: 8d8c7c5727ed11424501f8f10246adfa000f99362da019e21cddc2751a2d003e
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=excellence+playa+mujeres+reviews PDF link annotation
    • http://jajuviramigawo.medianewsonline.com/tamepupunigudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fe908eb1d261.pdfIn PDF document text
    • https://buwirudoxux.weebly.com/uploads/1/3/4/5/134597973/0da0e2fc862.pdfIn PDF document text
    • https://tedagenuv.weebly.com/uploads/1/3/2/6/132682668/gulito-bajon-jejivimi-wukapipurid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6014099a1a96e.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/b6Npgfi/move_whatsapp_from_android_to_iphone_after_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fd680e4af9ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5fe2ecb3611c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_602089caa18d3.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/pegodutelimuwuxideto.pdfIn PDF document text
    • http://paruweropu.iblogger.org/56211483652.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/vuxevoputegi-kulej.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/8gcicmG/pexidewujewilumasa.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/diejhhc/good_wolf_wallpapers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobeminal.atwebpages.com/information_on_human_trafficking_in_the_united_states.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_d8f28878fa0c4bf68c90e72fe9f5f690.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_49d3badf7abf41218cc4c05620804091.pdf?index=trueIn PDF document text
    • http://waxobutadarase.rf.gd/85701628268.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/types_of_drill_in_indian_army.pdfIn PDF document text
    • https://5d7339f9-c273-460b-87f2-4f5aebca05c5.filesusr.com/ugd/738632_84b3276f327242978425f90e314d3992.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_20c1f672e65349d2933d7433dfe1f2a4.pdf?index=trueIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/because_beatles.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_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 5436 bytes
SHA-256: 5aab46616691492746a07df38c674afc616ee935986b4dce9b17a888e083517c
font_01_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 10804 bytes
SHA-256: 6d975898608bfbc68463e121c3e4483b325b89cb89a4feab6baf28a241aff80e