Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fd42dfc51673ce…

MALICIOUS

PDF

72.9 KB Created: 2021-03-22 13:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a82a9132a1343d5037d24e800cd31123 SHA-1: 23b5b16151daf8741e3761eb762c896eae983cc5 SHA-256: 54fd42dfc51673ce9c100997cf4fbe953f750f2bf7537240086f48acc5a5eb6c
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. It contains a significant number of external links, with many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The presence of URLs like 'http://riwotivadejud.sportsontheweb.net/beretta_92fs_compact_grip_size.pdf' and 'https://golowaki.ru/aws?utm_term=the+scalpel+and+the+silver+bear+kindle' points towards an attempt to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/aws?utm_term=the+scalpel+and+the+silver+bear+kindle PDF link annotation
    • http://riwotivadejud.sportsontheweb.net/beretta_92fs_compact_grip_size.pdfIn PDF document text
    • http://lugabev.mygamesonline.org/41139542923.pdfIn PDF document text
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/eea24eb3fada.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/2091686.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/44cf1e9.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/d43152410c.pdfIn PDF document text
    • https://mixabukosi.weebly.com/uploads/1/3/4/4/134479433/5517891.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/how_to_write_a_personal_reflective_essay.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/zokaxazosixewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xisefowu/7265077387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31dda1a8-82a2-4199-9646-c9b1f85bb9e0/98494436801.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/speaking_topics_for_ielts_with_answers_2018.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_1ace1dd3a9b14551bfd8309c602a6b1f.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_c9b3effe688f440a86d3967a8eb426aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f8949d-0fdc-456c-aaef-1012c0430115/18260503740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb49328-cddc-4f56-a186-c5948d8f68c1/5240861262.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_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 5372 bytes
SHA-256: bd99b99f898935655623c1bdbff4326816af7cd071652cee448057bbf537a137
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 10624 bytes
SHA-256: 1809b399ea561e2b8562cbd8c8c945690864f61d5de23596587ad0d7b0202f69

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