Malicious PDF — malware analysis report

Static analysis result for SHA-256 4421eab584f08515…

MALICIOUS

PDF

121.1 KB Created: 2021-02-19 13:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0606a09db2604ca3283d92a8d90ca29f SHA-1: 0f0efc8b71fff75d8f6c17b3903a39f01fd5d1c1 SHA-256: 4421eab584f08515848108df153fbdb4f1c47674624bd50da6e3a2b4c3b9783c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also identified this as a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=plato+republic+book+3+music PDF link annotation
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/0bcf4e952cc50f5.pdfIn PDF document text
    • http://vashmaster.info/37479182209jpn2q.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/de75ad53bbee7e6.pdfIn PDF document text
    • http://kefets.xyz/todutct0y4.pdfIn PDF document text
    • http://salebox.shop/lotumydtm9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6011313505cf4.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/riluzawij.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/xabivi.pdfIn PDF document text
    • http://greyfruit.space/welibun4n22.pdfIn PDF document text
    • https://fepuvagugi.weebly.com/uploads/1/3/4/7/134767339/vifozazawoguj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5fe0beea7105f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd68ae6db768.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/jifesu/88820713322.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/12394985394.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/witegufamunuwutex.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/romantic_couple_pic_sharechat.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_off0001a147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A147 5448 bytes
SHA-256: 9ba234e0adc194c01f86bd0d524691b4715bf98fe5364da16c5dd2a938458f46
font_01_sfnt_off0001b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3B4 10428 bytes
SHA-256: 49de33c5ac6b0aaba0f3aa0596ee7075d3ac62bbbb18fbf8f9a7ad52237d304d

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