Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d21de916a1fc17b…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 20:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 673c161c1a9cbb0ed82e028266b7674a SHA-1: c33bdcf6d0421e0c454c6b4cdb2385c213966e01 SHA-256: 8d21de916a1fc17ba927aca8f7f3e56c957fef0999064ec93b4080b723e7beef
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/wix?keyword=lowes+background+check+email PDF link annotation
    • https://desagudag.weebly.com/uploads/1/3/4/6/134676200/lanukaz.pdfIn PDF document text
    • https://tasukivokojut.weebly.com/uploads/1/3/4/5/134592673/3982230.pdfIn PDF document text
    • https://nunuwipan.weebly.com/uploads/1/3/6/0/136002942/45079e9daa3105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fcd369fef32c.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/5961673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_60467a5524c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_605f5eb10a36c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5ff3066d15635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_60338ab08297e.pdfIn PDF document text
    • https://zosotise.weebly.com/uploads/1/3/5/3/135393527/jodexipomabokaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_601f843d7de46.pdfIn PDF document text
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/tujofakupefex.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/zuletawixizud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_60041956230c6.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/fc89726c-e691-4de0-8678-bba5202d18a9/povekebupizesuduxuzaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc9592e-080f-4364-87f2-64f1ca41ccf7/how_to_calculate_manpower_requirement_in_manufacturing_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/jelaxipozejajakituzeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/sopa_de_letras_para_imprimir_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bdfa53-e570-44c8-baec-03c4f6910a68/genie_3060l-07_program_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad622c84-b335-494a-9853-6659073219b6/garasufupimupabupekiripi.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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 5592 bytes
SHA-256: eafcc7c15936a0a959c849fdd524c0b545280b43b6ae46dd64d290bc1213adac
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 11220 bytes
SHA-256: 25bb69eee326b2c377c014e0672072eeedfe927e03067782e03b3418a6190383