Malicious PDF — malware analysis report

Static analysis result for SHA-256 a299240cd5aab036…

MALICIOUS

PDF

63.8 KB Created: 2020-11-24 09:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c5e0384fe8c90b30e1ca740b95437fda SHA-1: eae470a4bcf8ef9a074bbb0c24988514bfc1bbdb SHA-256: a299240cd5aab036598933a8ac7e90708d1da526a17ffff5e3b4fdeec431e188
244 Risk Score
Tags
free-cdn-ebook-manual-lure

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, exhibiting characteristics of a link farm. It contains numerous embedded URLs, with a critical finding indicating a link to known malicious redirector infrastructure. The document body is heavily obfuscated and likely contains further malicious content or redirects, though no scripts were extracted.

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
  • 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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=densidade+linear+e+planar In PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/70e8a562cf4.pdfIn PDF document text
    • https://tojezupemizeraw.weebly.com/uploads/1/3/4/6/134629845/najebesomijigagato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5fa86b3438c34.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/pojidimuxe.pdfIn PDF document text
    • https://gipusarele.weebly.com/uploads/1/3/4/7/134708700/fizitasopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_5faa29a5bd2e9.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/63343506.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/zivopiliwuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5f8e8651993ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ad24bc-fbf3-4a2d-980f-bbfaca6b7bc9/barbie_malibu_mall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ee0b68-a974-4128-a2dc-d44a83cf7863/13579079091.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/85976222369.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/bridging_visa_b_form.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_off0000bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 4952 bytes
SHA-256: 91af2c1915371f6854b2e2cf4b049040c46a13f9cc0cf3fca0bd4d497d12658f
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 11544 bytes
SHA-256: 8be6ed53d2ac20d0edf4bd8f26499d9e3954d2dc8c8ddbcfe89d30f4ee4dc515

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