Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d541230c196170…

MALICIOUS

PDF

67.2 KB Created: 2020-12-01 11:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c059e30f38b1f55afaf674e72f88bf SHA-1: 15a90c33879354870da18dc2260aedf70782a3a5 SHA-256: 16d541230c196170b70d849ebf7de3ef6c3a4c2c6f96041f4c0d987c063df9ae
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a phishing or link-farming attack. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=edtpa+task+3+assessment+commentary+examples+physical+education
    • https://mowejeli.weebly.com/uploads/1/3/4/6/134672800/sosojamawebe.pdf
    • https://taxepenobeg.weebly.com/uploads/1/3/4/3/134355702/noledenen-xutawaxubewo-fepadalizoxoz-gubojojur.pdf
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/29e8f177732d8e.pdf
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5fc35c4102232.pdf
    • https://nipifofopofeduv.weebly.com/uploads/1/3/4/3/134338269/kutadotejavufiwoza.pdf
    • https://dobaviwipiz.weebly.com/uploads/1/3/4/7/134766835/9462f2ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gumegulaxi/warframe_phobos_junction_guide.pdf
    • https://s3.amazonaws.com/litunux/56495379541.pdf
    • https://s3.amazonaws.com/semuxemakaw/70197672443.pdf
    • https://s3.amazonaws.com/jubiferekaka/tecumseh_engine_carburetor_bowl_gasket.pdf
    • https://s3.amazonaws.com/dotivaf/91141423474.pdf
    • https://s3.amazonaws.com/guvovigo/84326982200.pdf
    • https://s3.amazonaws.com/lewuli/codes_for_free_gems_on_clash_of_clans_2020.pdf
    • https://s3.amazonaws.com/pesetufavo/meaning_of_segment_reporting.pdf
    • https://s3.amazonaws.com/medetopuwofetut/tijizufenowojoduzasi.pdf
    • https://s3.amazonaws.com/xoguwavosuje/cytomegalovirus_treatment_guidelines.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_off0000c882.bin
ccdbf0a591d4ef824c2f832f79cb32135848374b37c5248f782f358b8ef796f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 5668 bytes
font_01_sfnt_off0000dbae.bin
304e3c7b09777a3967c67e3cd61ee62a92753a704eb29285e095d67eef0ffdf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10400 bytes

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