Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69be74241dbba7f…

MALICIOUS

PDF

98.0 KB Created: 2021-01-11 07:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c43256ccdc49cfe0ab5cd0cbd5b670bc SHA-1: 7fdc7d65563a3f4e5ee84569b87976b30bc38d26 SHA-256: d69be74241dbba7f0b00d19ac91f3d9ef3e401baecb03e00ef7e2c3f9d52db25
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on services like Weebly and Mozfiles, forming a link farm. One of the initial links directs to a known malicious redirector. The file is detected by ClamAV as a phishing trojan and flagged by a machine learning model, indicating a high likelihood of malicious intent. The primary attack pattern involves luring users to malicious infrastructure through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/aws?utm_term=benzocaine-+menthol+topical+drug+information
    • https://vekeliludodim.weebly.com/uploads/1/3/4/7/134745250/8b52c691ae2a2.pdf
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/xupudujimaba_xujaro_mixiga_vipapinamasa.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/c903a4f.pdf
    • https://cdn.sqhk.co/supesuvepo/2gfgght/37231731796.pdf
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/8163094.pdf
    • https://site-1172565.mozfiles.com/files/1172565/xafoku.pdf
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/vigiro.pdf
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/7652382.pdf
    • https://cdn.sqhk.co/gugapedulob/bshhmge/cute_hairstyles_for_short_hair_braids.pdf
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/21d165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tipikaxe/77290012498.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/86710027532.pdf
    • https://s3.amazonaws.com/dudurat/benzene__icl_alcl3.pdf
    • https://s3.amazonaws.com/nisoxow/canon_drivers_mx492.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012045.bin
70343c20c9407c3ad86120918aef76a3142b518b003bb479f413ef50d9e02789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 5524 bytes
font_01_sfnt_off000132f7.bin
d970b5e7561517da19d45f21fc555bd007f1eb0bcd77b3433ebd98c73944d90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 12900 bytes
font_02_sfnt_off00015cc5.bin
a133709038072853ef13c2cd6d438f6ea09648054d0240fa62737ab7b209f3e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC5 18856 bytes

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