Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5123024a907e36c…

MALICIOUS

PDF

69.2 KB Created: 2020-12-25 06:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 94ec4542a47d0a5e611ab773167bd9ef SHA-1: d7ec45a9bd66eacb0fa909785b5f64497fb9ad11 SHA-256: a5123024a907e36c403b8c6391566d830e02a245c76889af4ad63c78cabe600d
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure and a PDF link farm. The embedded URLs suggest an attempt to lure users to external, potentially malicious, content. While no scripts were explicitly extracted, the nature of the heuristics points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=sweet+peas+and+saffron+vegetarian+meal+prep In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5f9ec33786e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_5fc228c1a0022.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/zofadavumutog_robobelurek_tokejov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fa57b1ab4973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fa7628bf3e07.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabumumiw/BhiIYif/xelagipovojegu.pdfIn PDF document text
    • https://nurirekesuvakip.weebly.com/uploads/1/3/4/4/134404885/89cc5bea0f5e.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/6028354.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/liguwubore/94587868687.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/25004348629.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/fulivuwatajumixifoneje.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/alice_in_wonderland_children_s_book.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/44310805392.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/39298668789.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_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 5616 bytes
SHA-256: 0472a4c41999618d4a800d99ed93f88313c435506fafdbb859f47aef32e20260
font_01_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 10920 bytes
SHA-256: 0a854161e7e77773fd6bbf999aed6640ee38bf325932f26e608f1401cf8ebcc7

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