Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d7db1b9dcc6fa4…

MALICIOUS

PDF

82.7 KB Created: 2021-06-08 04:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2082e7603a2a9533dc3024928d80a316 SHA-1: e4dcc0a223b77875a420807bdaa8ca41feecd8d3 SHA-256: 59d7db1b9dcc6fa4e9c7325da2e1010706f146d7df8e8d3c728e48ed133995ce
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the heuristic firings related to SEO link farms strongly support this attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/123?utm_term=bibliographic+data+format+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C PDF link annotation
    • https://popugimamad.weebly.com/uploads/1/3/0/7/130775647/840a74.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/164953.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/1e9bfc8899a737.pdfIn PDF document text
    • https://sanupeden.weebly.com/uploads/1/3/5/9/135961416/felekelisu.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/bapebutowa.pdfIn PDF document text
    • https://sevipopiwipuf.weebly.com/uploads/1/3/5/3/135302768/d3147.pdfIn PDF document text
    • https://ruzetutenu.weebly.com/uploads/1/3/4/6/134633181/woxuwubitoxukugugaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418367/normal_5ff2dace29bd2.pdfIn PDF document text
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/7215148e09a90.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/8062168.pdfIn PDF document text
    • https://gulemexaw.weebly.com/uploads/1/3/4/3/134360266/gozakix_gatoxitozefux_benepupudotu.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/7304619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_605b8aa0a7966.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4494417/normal_60b3b26e4b78c.pdfIn PDF document text
    • https://rokikifovamodis.weebly.com/uploads/1/3/7/5/137511883/1495560.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/52ba8.pdfIn PDF document text
    • https://lenoloxib.weebly.com/uploads/1/3/4/0/134040664/lokuruka_zomudino_witejijokal.pdfIn PDF document text
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/fda67f3277.pdfIn PDF document text
    • https://momogomuwe.weebly.com/uploads/1/3/4/8/134885938/nojowetevo.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/3ce2fa04-6906-4f44-9a1c-4005c3efd1f3/basic_english_book_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8c608f-2669-4992-aa6c-22a0cb3fbfb1/data_science_internship_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8dff9d-13d9-4d63-9777-6d225390c9a0/what_to_look_for_in_a_mobile_home_inspection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15cfb8c-97f9-410c-b543-118bc544c04b/safety_insurance_massachusetts_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e31acc8-9f68-42b0-9a75-f976b983e79b/73629195749.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_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 6208 bytes
SHA-256: c5ec50ca840a4c98c0300a1ffb3b34ca86782ec9aa96bb08e6bcba812978a2b3
font_01_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 10848 bytes
SHA-256: 9c9bb5aa9d22d5a2772e37741625dc4da985d9aaf99ebd0b323783e9a935abea

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