Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aea630ee44db1c8…

MALICIOUS

PDF

79.7 KB Created: 2021-05-18 13:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc40f34e0eb305d27b8ea15de2341d35 SHA-1: da41f92b940aec12fae9a0a128ab4e5264d8d0e0 SHA-256: 2aea630ee44db1c8edb221812c37897ebd983aa110fe39fc976a65f75a669dd8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://zajinet.ru/strik?utm_term=download+tema+power+point+tentang+sejarah', appears to be a lure for downloading presentation-related content, likely a pretext for distributing malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://zajinet.ru/strik?utm_term=download+tema+power+point+tentang+sejarah
    • https://static.s123-cdn-static.com/uploads/4475406/normal_5fdf2ee062002.pdf
    • https://cdn-cms.f-static.net/uploads/4451955/normal_60538aee5abb8.pdf
    • https://cdn-cms.f-static.net/uploads/4482190/normal_604754dfe2cd4.pdf
    • https://benukozememig.weebly.com/uploads/1/3/4/4/134480731/4839b83071e7.pdf
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/laxop.pdf
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/bbcc3bff49.pdf
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/zomuta_wuvitazi_lesikide_pazuvupur.pdf
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/d53d73aaf6c6e.pdf
    • https://cdn-cms.f-static.net/uploads/4498868/normal_5fe999f465808.pdf
    • https://static.s123-cdn-static.com/uploads/4460447/normal_600101f2e4107.pdf
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/maropuwegez_kidutowosirefeg_farovilumexoxix_fusudi.pdf
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/938077.pdf
    • https://zalidumi.weebly.com/uploads/1/3/5/3/135351231/pipopopijisewe-potodej-tobexutuga-kajomome.pdf
    • https://cdn-cms.f-static.net/uploads/4412170/normal_60644db1210eb.pdf
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fdd29c6c0c3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pafomotaxo.epizy.com/75534134391.pdf
    • http://mapesag.epizy.com/aadhar_using_face.pdf
    • https://uploads.strikinglycdn.com/files/35371fb5-eb39-4130-a72b-29a467dd2542/vajutuluporomegomagopuxuj.pdf
    • https://uploads.strikinglycdn.com/files/93f8ea60-9387-4af9-8fa3-0a7d05d793ce/32851050217.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_off0000fae6.bin
b5a35c115bae052f815f9109359e73a0780c9bb2004a59926df5d21683ae9497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 5540 bytes
font_01_sfnt_off00010dab.bin
15b722f777296ff996afb7251b722a522ff7ef19d68651cf5f2cf7ec6e938b34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 10028 bytes

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