Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf53de254d270bc…

MALICIOUS

PDF

76.6 KB Created: 2021-02-05 05:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 95e0ab5b0a881f7c95b876b9d3c5b02a SHA-1: 7813f4ca2c93774ce4045221558742d45f575fc2 SHA-256: 9bf53de254d270bca31155a3245c4dea205c8ed8a6503a65908327c768b76309
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=silicon+fuzz+factory+schematic PDF link annotation
    • http://refesuf.22web.org/47064065020.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/hW5j34l/96657913664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_5fe9d8dd318da.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/2801245.pdfIn PDF document text
    • http://puwisagoki.22web.org/jifaxovu.pdfIn PDF document text
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/zotifijuj.pdfIn PDF document text
    • http://rabota-plus.club/wewumobuzagezetelofukipulqd3d.pdfIn PDF document text
    • http://tamakar.xyz/breeding_rabbitsua1g0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_600ddde1ce87a.pdfIn PDF document text
    • http://orbitan.fun/96270513702l6hsj.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/geQi3PA/adderall_xr_vs_ir_price.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/gi7JgdD/what_does_spearman_s_rank_correlation_coefficient_show.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/derumawazufa-deguxu-potexapinogijob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468831/normal_6002a96883581.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/61IZjhU/virus_news_us.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/android_set_image_bitmap_not_working.pdfIn PDF document text
    • http://kusofiwu.epizy.com/93705123980.pdfIn PDF document text
    • http://renidududup.rf.gd/dewufabon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 5376 bytes
SHA-256: 537cb71a15ecaf1bc7444db24e6d992d6b9c06f77a9fe735404e021d990b8041
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11388 bytes
SHA-256: 9f6b45342dc2120e51c3a739c3613d642cd510c3b314bbfb3c55470394678945

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