Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4cda5d6ba1afa3…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 05:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a3b013a26d86927a4414e9dcfa46df13 SHA-1: 0dda41dcf1f4cb46c2353c00f6882bf4487d1404 SHA-256: 4e4cda5d6ba1afa389d01efcbcd994d349c866d48b6ae158f7d9235e5093a580
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a specific focus on SEO manipulation. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

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://gimoguvi.ru/123?utm_term=ironing+fitted+bed+sheets PDF link annotation
    • http://bigijawiv.scienceontheweb.net/46666469993.pdfIn PDF document text
    • http://paselon.getenjoyment.net/a_little_history_of_the_world_book_review.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/les_miserables_broadway_2014_full_show.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/gczKDEb/tri-_color_gold_rolling_ring.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/cjcjbBB/skipping_rope_workout_challenge.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/alphabetical_reasoning_questions_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/7mejchd/tubemate_download_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/hcHjdjf/55850896132.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/free_bank_exam_books.pdfIn PDF document text
    • https://cdn.sqhk.co/lukejisuvawe/3yqgjvZ/74493222276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_39f72c22ecf64934bdbc1897bb98147e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fcd9dbd-c174-4946-a124-1326926f88e9/what_is_gothic_literature_ks3.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_0ac92fbd9cdd415f89c43518e8f5302c.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_e2c48e7acaa84d6eb10a0b9ed91def95.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_41d5639d94f946d3af579686e25dd5d6.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_807b3e7a1dc84359b8c44fc8ca20a63d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee5f4ed-baad-4d55-b8ba-174702ab05fa/how_much_to_charge_for_a_graphic_design_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a0f27e-8d39-482d-b0d4-cf74bc5b535e/the_way_of_the_world_summary_act_wise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2869fe-1ae8-44b2-9a4b-452f6a41963b/37570508141.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_55d84097f3a44713a1439017c5008222.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_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 5004 bytes
SHA-256: 094f048ade4d15d70deaadbc70d9a3d842d8cf981cac85527d408080d6d9c926
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10884 bytes
SHA-256: 44704f084dfd6553902b78ca88cdc4c5532863387f02fc2dc78a64099b0e41ad