Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ecf816a1e27d16…

MALICIOUS

PDF

75.9 KB Created: 2021-01-23 16:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b69844bc1a0e625f409fde490df8fb9 SHA-1: 0843ffa74b59742d9fb9f84eae28922a9c9410a7 SHA-256: a2ecf816a1e27d16ce3c505266a313757d2b93fadab2adffb70e1fd1ee65e742
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The primary malicious IOC is the URL 'https://yafferge.ru/aws?utm_term=w3layouts+responsive+templates+free', which is presented as a download link for free templates but redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/aws?utm_term=w3layouts+responsive+templates+free
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5ff3ec23ea1ed.pdf
    • https://site-1175198.mozfiles.com/files/1175198/kuvelipudoxototemog.pdf
    • https://static.s123-cdn-static.com/uploads/4470218/normal_60066991a2de7.pdf
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5fd9d2b135083.pdf
    • https://site-1172119.mozfiles.com/files/1172119/93232585835.pdf
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ff671bb7bdb9.pdf
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5ffbbe843d14a.pdf
    • https://site-1171649.mozfiles.com/files/1171649/10753061022.pdf
    • https://site-1189081.mozfiles.com/files/1189081/android_pay_age_limit.pdf
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5ff6a020ce846.pdf
    • https://cdn-cms.f-static.net/uploads/4417220/normal_5fe68dc498da6.pdf
    • https://site-1201991.mozfiles.com/files/1201991/64507026032.pdf
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5ff2c1950fe30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wukara/vmware_interview_questions_and_answers_for_l2.pdf
    • https://s3.amazonaws.com/papuja/68511495190.pdf
    • https://s3.amazonaws.com/zowejunef/formal_dresses_uk_cheap.pdf
    • https://s3.amazonaws.com/pivetuzadujo/waviwagesovar.pdf
    • https://s3.amazonaws.com/fedure/tovofiramiragibunigus.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_off0000ed5b.bin
4c47e95fb2fccb7f95500922377c9f09b7f2cc89a8d93ff31cd1ed12cf1eee4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 5388 bytes
font_01_sfnt_off0000ffb1.bin
1f692e3b3629a7ae7ce25b6c1e4018d175f5ffbcbf83eff665e7451ddb156b43
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 10080 bytes