Malicious PDF — malware analysis report

Static analysis result for SHA-256 63458bdf0df87788…

MALICIOUS

PDF

73.3 KB Created: 2021-05-23 15:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc44a61a7ead459176df8ef0fac5aed0 SHA-1: ac3070b805975302146f005c598da740a5667aac SHA-256: 63458bdf0df87788a4886bffe38aebcfebd6ab50df65fa370c5e575ace562c5c
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://ponafet.ru/strik, which is likely used to host a secondary payload or redirect to a phishing page. The document's content, though partially obfuscated, appears to be a lure related to cover letter engineering.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+to+write+cover+letter+engineering
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/16ba4e00.pdf
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/c27bbd4c.pdf
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/4caca83f.pdf
    • https://mekufaro.weebly.com/uploads/1/3/5/2/135294947/wodewokeralo-fekipofowopa-moxogixeb.pdf
    • https://bibixofepo.weebly.com/uploads/1/3/4/2/134235383/2894217.pdf
    • https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/ca5703c7.pdf
    • https://pirulilepeno.weebly.com/uploads/1/3/4/0/134040853/nikovoxobusake.pdf
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/fepinu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14a64263-0ca2-43f3-85b6-ec820c59e45a/mazitixedosikupop.pdf
    • https://s3.amazonaws.com/zolerazowubow/i_am_that_girl_book_review.pdf
    • https://uploads.strikinglycdn.com/files/44a6758b-c7a5-48ca-9cbd-9f74c4356666/que_es_la_linea_del_destino.pdf
    • https://s3.amazonaws.com/zafijukopa/scientific_calculator_pro_apk.pdf
    • https://uploads.strikinglycdn.com/files/0773e273-afea-44be-afe8-a5c760b2f732/how_much_is_a_transmission_leak_repair.pdf
    • https://s3.amazonaws.com/tobojelusiwi/xuvakabisimo.pdf
    • https://uploads.strikinglycdn.com/files/258690a0-8270-4f5e-abf7-278f8d22fbf3/vuxovoperirefiwabep.pdf
    • https://s3.amazonaws.com/xafaxotaful/bloons_td_5_free_apk.pdf
    • https://uploads.strikinglycdn.com/files/efd5d341-2ff5-41af-89c2-2a1683d85f33/5685520958.pdf
    • https://s3.amazonaws.com/kukazowox/80454450503.pdf
    • https://uploads.strikinglycdn.com/files/de13eb32-1121-455a-8c44-fa3506f879a6/samsung_wf42h5000aw_a2_troubleshooting.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_off0000e37e.bin
dec6afd7b79834dad54c22408ae0e721df04a4f612055f17b63c58eeda8cdcf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 4692 bytes
font_01_sfnt_off0000f39d.bin
2cc3f0174a426857745727639976ce5d6ef4d364dbe2bf672c8fc334185881d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10720 bytes

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