Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd76054b5fd4a87…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 07:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 101fe454e871b88db889908f974c6960 SHA-1: b238a12be887c882cec3346c88fbf89f8068466e SHA-256: bfd76054b5fd4a87e82f5ec5d0ac8e33bd9152d22893a4b786c4c11797c91e3b
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://maypoin.ru/award?keyword=autocad+2020+manual+book+pdf PDF link annotation
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/f72a594a28ca.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/9d0683c67199f2b.pdfIn PDF document text
    • http://save50it.info/fundamentals_of_english_grammar_4th_edition_downloadryod9.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/lusimeworonuzerirudhpl2q.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/225d33b8.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/5965573.pdfIn PDF document text
    • http://koreanluxe.com/odyssey_with_line_numbers9kaj7.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/pasalonidif_putasutonujikes_gabawebo.pdfIn PDF document text
    • https://dowizipolejufu.weebly.com/uploads/1/3/0/7/130775784/916d2deeb08bb.pdfIn PDF document text
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/1206437.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/panatidetozesiwopufuxev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bememikat.onlinewebshop.net/infinity_war_thanos_snaps_his_fingers_and_everyone_dies.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_28778a5dfec942b18a041c0a34647821.pdf?index=trueIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_1e2e0de18ec7459fb3bbc63c91535c21.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_69126a08982b4807b041ebc6a4d0714a.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_a4ed03ea86254fe690a3605e683aaf63.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_ff9f94138e2941d693f9f1567c6d77f7.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_f3ead067ffe84a639a5f8ae7b66a0eec.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_70bd60d525fc468e9ed284bace1d2101.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_ca6b2ada74774c6da1e19a01856bdeef.pdf?index=trueIn 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_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 5492 bytes
SHA-256: ceacaacd1007b6bac03313d9298b0b612f8d3cae5532c57ffde380a5f789d3d7
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10780 bytes
SHA-256: cd6bbdf4ce73c792fc0a4b61cd3de87493f8742b6e5a04ea914f629a92be29ce