Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5bd28273adf09a…

MALICIOUS

PDF

76.9 KB Created: 2021-06-14 19:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17654c97ae4fe6d06fff2731040f8cfd SHA-1: 4bc50e8ff6282c3303c3d38006a304023f010e97 SHA-256: 9a5bd28273adf09af2aa3630855bac82490eec0f2e40c0cec21c1f9a6a984646
156 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 phishing or trojan threat. It contains numerous external links, forming a link farm, with one prominent URL pointing to a site related to 'how to remove grohe kitchen sink faucet'. This suggests a social engineering lure to drive traffic to potentially malicious websites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wb?keyword=how%20to%20remove%20grohe%20kitchen%20sink%20faucet
    • https://static.s123-cdn-static-d.com/uploads/4486060/normal_60aff1fca7d28.pdf
    • https://cdn-cms.f-static.net/uploads/4454973/normal_603470d80d6c7.pdf
    • https://tumolapeferuf.weebly.com/uploads/1/3/4/3/134363109/levaniwil.pdf
    • https://cdn-cms.f-static.net/uploads/4409092/normal_6048fb23a0c46.pdf
    • https://cdn-cms.f-static.net/uploads/4450242/normal_60be8085e4267.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/cc8fc5b4d39.pdf
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5ffb399ac4558.pdf
    • https://bosofivi.weebly.com/uploads/1/3/4/6/134668799/rafililazinudom.pdf
    • https://cdn-cms.f-static.net/uploads/4410214/normal_6066af4ebec90.pdf
    • https://cdn-cms.f-static.net/uploads/4450338/normal_5fd8915180d30.pdf
    • https://cdn-cms.f-static.net/uploads/4417329/normal_603fb3f1a91ae.pdf
    • https://faperusa.weebly.com/uploads/1/3/1/4/131454178/punegipekudob_gotus_winigox.pdf
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5fdd8965d15c1.pdf
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/jajiwimozexonafokun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wukisifoker.pbworks.com/f/sao_alicization_ep_25_release_date.pdf
    • https://uploads.strikinglycdn.com/files/e81ba6ea-9266-456f-8556-ec805d191f98/r_programming_language_course.pdf
    • https://uploads.strikinglycdn.com/files/dd3d4644-9f66-4c70-aff2-291fa040cc98/39954728465.pdf
    • https://uploads.strikinglycdn.com/files/0ac097b5-811c-451b-b7dc-bb57105cb0ca/weight_limit_for_car_seat_facing_forward.pdf
    • https://uploads.strikinglycdn.com/files/07d295bb-a5f8-40bb-94d5-278b303f7c05/developmental_biology_11th_edition_reddit.pdf
    • http://lebamojopa.pbworks.com/w/file/fetch/144694884/41998374120.pdf
    • http://zuxanuj.pbworks.com/f/tailoring_leveling_wow_classic.pdf
    • https://uploads.strikinglycdn.com/files/25a67dc3-dc25-403f-8b7b-7fa3e8d1f8a1/4432135744.pdf
    • http://bujolajoxek.pbworks.com/w/file/fetch/144514875/85477639804.pdf
    • http://dutamaboxiwa.pbworks.com/w/file/fetch/144801264/inductive_and_deductive_reasoning_examples_math.pdf
    • http://majemekux.pbworks.com/f/diterunadub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef36.bin
f291e90e0a27a7b4075d6233141208845d0bd55a14954910cf39f9d1468ec6bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5440 bytes
font_01_sfnt_off000101ad.bin
cabbfc03750431ef1c5962fc3838453e7a5a133b8945145568be1deeea975f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 10556 bytes

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