Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3d9aa7dbde2c41…

MALICIOUS

PDF

70.0 KB Created: 2021-04-22 03:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae17e02c9cd17c66c6831cd119fc17a6 SHA-1: 76fc1c8edfbd366e3d82a08780c639cc4c18e1ac SHA-256: fa3d9aa7dbde2c4197e527ef1dfabce0de5b4f66f69eeb51b575a0760fdfa0b7
104 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The presence of an embedded URL and the 'PDF_SEO_LINK_FARM' heuristic indicate an attempt to drive traffic to external sites. While no scripts were explicitly extracted, the 'ML_NYX_PDF_MALICIOUS' heuristic and the overall structure strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=how+to+work+hot+tub+controls
    • https://fasukawoj.weebly.com/uploads/1/3/1/4/131453618/pitapilazutilo.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/razimasugili-faduf-waweveperaf.pdf
    • https://xumolatakikekum.weebly.com/uploads/1/3/4/3/134335049/f591a9e8374.pdf
    • http://4d-5d.com/74998386647cx8py.pdf
    • http://beststudent.fun/how_to_get_knots_out_of_climbing_ropevgqnm.pdf
    • http://potoborotagivud.22web.org/handwriting_practise_worksheets_for_free.pdf
    • http://cloudmarket.website/ultra_capacitors_deshpandesz4pf.pdf
    • http://mugedly.xyz/how_to_open_on_kindleazotk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2cd4baa-1e16-4a3a-98ae-5b465570e850/david_sedaris_santaland_diaries_youtube.pdf
    • http://xilimagokenojik.rf.gd/guvazowa.pdf
    • https://uploads.strikinglycdn.com/files/841c841b-eb1f-4f61-9ef2-11e3afa6025b/47860224811.pdf
    • https://uploads.strikinglycdn.com/files/63f21870-6742-4a5d-bda2-61e7d708c1d7/honda_gc160_water_pump_manual.pdf
    • http://pajogapusifured.rf.gd/jigokezeze.pdf
    • http://lemiwiwivafato.rf.gd/60214353070.pdf
    • https://uploads.strikinglycdn.com/files/bca56e6f-a389-4503-82ae-e3c580f47aa0/tanidiwonawepokusetuxu.pdf
    • http://ganubigeponato.rf.gd/99016081655.pdf
    • http://peburameg.epizy.com/arduino_pro_micro_pinout.pdf
    • https://uploads.strikinglycdn.com/files/3cac51b2-90d9-465c-ac04-5887a7ba0edb/dizagepukaguvasixuv.pdf
    • http://bigisewolax.epizy.com/81689983212.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_off0000d5f1.bin
028420b41081b6fb9e5334024d7b8ae27f1ce4fe6cbfde4a0d4ea1a145e2d945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 4936 bytes
font_01_sfnt_off0000e6c6.bin
2df4a87c020d7daa2e5b2e662280d7f74c4274a22809bc0223a04af18e1c06be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10608 bytes

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