Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9b2b4531975a45…

MALICIOUS

PDF

74.9 KB Created: 2021-05-30 23:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4285dfa28d1f501ec9203fc8f301b8 SHA-1: 4fdb779d639b8f4c78059c3ad3622bb17f405ea9 SHA-256: bc9b2b4531975a45acb58244af64f3baf8d747e385a5ac69921e329d626e8db3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://midufefew.ru/123?utm_term=la+cicale+e+la+formica+canzone
    • https://cdn-cms.f-static.net/uploads/4491175/normal_6058c4e9d92c2.pdf
    • https://cdn-cms.f-static.net/uploads/4378607/normal_60100fb5164ad.pdf
    • https://zinenefubodejig.weebly.com/uploads/1/3/4/3/134338026/tesadebanoninu_palolakaje_gekemaruk.pdf
    • https://pilinosaw.weebly.com/uploads/1/3/4/8/134852056/xodomowuto_vadojivovemox_fodowamoxovefow_zagakugul.pdf
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/kogaredeguruf.pdf
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/d719c36d3d09.pdf
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/b76932e274.pdf
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5ffd9f8305688.pdf
    • https://dizasufe.weebly.com/uploads/1/3/4/6/134680143/3211d6.pdf
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/4043367.pdf
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/lebipux-munudaxozaduwa.pdf
    • https://weroxodadugofu.weebly.com/uploads/1/3/4/5/134503620/lukeliketiz.pdf
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/9890793.pdf
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/xuladazurib.pdf
    • https://dujapiloxi.weebly.com/uploads/1/3/1/8/131857305/gaxibesajerulo.pdf
    • https://cdn-cms.f-static.net/uploads/4390092/normal_60564cfee8393.pdf
    • https://static.s123-cdn-static.com/uploads/4382186/normal_60020a6050a26.pdf
    • https://xuwawimo.weebly.com/uploads/1/3/0/7/130739806/546c76.pdf
    • https://static.s123-cdn-static-d.com/uploads/4501029/normal_60b06d75b8ec7.pdf
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/512daac9.pdf
    • https://cdn-cms.f-static.net/uploads/4455881/normal_600eab84806b1.pdf
    • https://jutasosunefobe.weebly.com/uploads/1/3/4/0/134012390/2fe3198e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e534.bin
712ffc7c29e0a551d6f559ddaaf59cc753207a11b9506839e143eae6e208db72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 4840 bytes
font_01_sfnt_off0000f5a1.bin
0735097df1bc15bdbd963acd0592adaffa5beb7235a35372c0f4d803205b22ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 12336 bytes

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