Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d12873379357674…

MALICIOUS

PDF

70.9 KB Created: 2021-01-05 23:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f307ee33d32b6dca04e41f35813dfbed SHA-1: f4070a593ce647fa69e6c10d3efa6abc9483750e SHA-256: 5d12873379357674212b8cdf114570942b53cc5fbfb83bb6a9217d7eb012f0e4
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malware through a large number of seemingly legitimate but controlled PDF documents. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=dise%25C3%25B1o+de+paginas+web+en+bogota In PDF document text
    • https://bisulejejokix.weebly.com/uploads/1/3/4/0/134042342/2036715.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/8b1e4a449b.pdfIn PDF document text
    • https://povuwifapijolak.weebly.com/uploads/1/3/4/2/134265363/riwugomaloxofasow.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/8aba5ba.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/nijenet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5fa7b5c6c612c.pdfIn PDF document text
    • https://kugakisan.weebly.com/uploads/1/3/4/3/134390280/jipezimeb_nujis_dezonev.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/gogoxowiniza/72789161342.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/growthink_ultimate_marketing_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/93468092240.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/arabic_keyboard_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7578792b-3227-426b-b35f-5f5ace2bfb37/devozujesidot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878c4659-de2f-4d8a-9c16-7152ae30f3df/bmat_2013_section_2_answers_explaine.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 5444 bytes
SHA-256: 0003fc9ceaad5cf413a63095e7d84ee97e7154a158a806498f2db1a91a907741
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 11552 bytes
SHA-256: a8d53b15fcbfeb3436c79e92cc786c7c57006aa764013f2011094f5397733716

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