Malicious PDF — malware analysis report

Static analysis result for SHA-256 c685acb9333eeaca…

MALICIOUS

PDF

74.6 KB Created: 2021-06-04 10:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fd81ac3f38b9f6f5204615b1cfa8ead SHA-1: b05c07a407e66f606d85b0f5b1f80908d48cba15 SHA-256: c685acb9333eeacac12f8f5e7039d6364e8505be8e3441db3dd7ce293a2567b6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to what appears to be a phishing or malware distribution site disguised as assembly instructions. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely involving a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nomylo.ru/pbw?utm_term=ikea+malm+twin+bed+assembly+instructions
    • https://cdn-cms.f-static.net/uploads/4366375/normal_601198310ce9a.pdf
    • https://cdn-cms.f-static.net/uploads/4495707/normal_605231b2b9576.pdf
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/3773682298.pdf
    • https://cdn-cms.f-static.net/uploads/4469145/normal_6055cc348a669.pdf
    • https://cdn-cms.f-static.net/uploads/4459914/normal_602bea43d06a5.pdf
    • https://static.s123-cdn-static.com/uploads/4413456/normal_5ff3d49720002.pdf
    • https://cdn-cms.f-static.net/uploads/4407788/normal_60b8b323f0f09.pdf
    • https://static.s123-cdn-static.com/uploads/4404964/normal_6001830f3d075.pdf
    • https://cdn-cms.f-static.net/uploads/4468261/normal_60b8a741c6c25.pdf
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/969cae546375a53.pdf
    • https://simujoxeripo.weebly.com/uploads/1/3/4/8/134846432/868382.pdf
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5fe33e0fbf7c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://guronavageba.pbworks.com/w/file/fetch/144498018/frases_para_desear_feliz_navidad_a_mi_amor.pdf
    • http://dawijunegolo.pbworks.com/f/90623312974.pdf
    • http://xojifot.pbworks.com/w/file/fetch/144423822/mtbf__mttr_excel.pdf
    • http://fudejob.pbworks.com/f/16321587555.pdf
    • http://kalunagepigi.pbworks.com/f/naruto_ultimate_ninja_heroes_3_download_highly_compressed.pdf
    • http://molosafokaji.pbworks.com/w/file/fetch/144544365/zojibisogasageje.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb22.bin
ddc4b79fabe57d9e2f0dc17e5bf1ec795c64dc4c05add66d4b968644d5ff3af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5420 bytes
font_01_sfnt_off0000fd90.bin
edd577e2b5750a0fa66dd06b5e8903ee0e3faac69bd17c9b880c9d04b693e3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 11452 bytes

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