Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f1cd4c564ccacb…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 19:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c2ab524fee3c31e05f663a235ef3932 SHA-1: bd66440caa06172616ba67dc403d176c3e3e5ccc SHA-256: a1f1cd4c564ccacb5f772aad691d82b6e3e4f2c79cd2e8a57c6d18d75aaa54e1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=ata+guidelines+thyroid+cancer+2014 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485711/normal_5fd7cfe7ca379.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/mixadev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_60638ec5b15c9.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/public_finance_and_taxation_notes.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/6b6968bf94b81.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/kipejidurewiso_rarafatilof_vekifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_60253c8c0fd26.pdfIn PDF document text
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/vajulov-gebijoxek-paxenuv-nunulurojub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_60336dc7a7499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_6058d75b0f456.pdfIn PDF document text
    • https://lareduna.weebly.com/uploads/1/3/1/4/131453109/4013107.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/jomomilasiwumururix.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/how_to_fix_jbl_flip_3_battery.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/0430639b-1771-4fbb-9ba0-98e412fdb8ce/what_is_the_role_of_mental_status_examination.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/fipozejug.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_d7a314a9ae1d4adc984a0ac84d6b92d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7767dc26-07f4-49de-a822-4df28cf985d3/hp_officejet_pro_8625_printhead_not_detected.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_cd54d353ae3b4c3e95dd8e3dc516058a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/929c9cc3-d00b-4d26-babb-d4591fcef19b/software_testing_course_free_online.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_000d0ea1aa674c5aa36620bfa33e1e54.pdf?index=trueIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_d0d235160d46402299e4eae7f60fe589.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c76a29-78c2-4bcf-a21b-627f1bf86499/94759699803.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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5704 bytes
SHA-256: ca1d74fd9e479bc14c9618cfa1b2051ecea55f2a5fb8b700e1100a260eb7b636
font_01_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 10456 bytes
SHA-256: 6d62b40f4f42db9f1f0b44bc95b9cc43b1a93133f9ffa0db2a524e72afe70f63