Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e4dcebdbc33a7a…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 01:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9daec2ad7c2e747f8d5a0bcef5e45c07 SHA-1: 93854d2c9cce5f43da87fe2db20a9ac996b90c18 SHA-256: 39e4dcebdbc33a7a7b38d3614abbe859b28548d50a96d89c9d17204399906d88
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/award?keyword=editorial+article+sample+pdf PDF link annotation
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/dusiv_ganaluxiwuwebe.pdfIn PDF document text
    • https://ranixujofenak.weebly.com/uploads/1/3/4/0/134016935/suvorinunuxiji.pdfIn PDF document text
    • http://indir-kazan.com/algorithms_in_machine_learningqdbuj.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/iiTyzig/14245218268.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/dghiihg/85199130138.pdfIn PDF document text
    • http://amsidisi.xyz/5317642063175y82.pdfIn PDF document text
    • http://salonlabs.xyz/case_study_method_of_teachingvlsy7.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/sejitezaruzijugasimu.pdfIn PDF document text
    • https://tamamola.weebly.com/uploads/1/3/4/6/134690119/d64809aa00c463.pdfIn PDF document text
    • https://xomixosusanit.weebly.com/uploads/1/3/1/4/131438267/5b711be8314720.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/jjFeYhi/jovukatorafosigezus.pdfIn PDF document text
    • http://gebajajax.22web.org/website_screenshot_chrome.pdfIn PDF document text
    • http://oneitstore.info/how_to_replace_lg_washer_door_switchia0l9.pdfIn PDF document text
    • http://gexedufez.22web.org/boguzenijuf.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/6ae3c5b1356.pdfIn PDF document text
    • https://jarowuvuvam.weebly.com/uploads/1/3/4/6/134614172/96b24dfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fulepabe.rf.gd/1275773340.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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 5256 bytes
SHA-256: b1f3dcef753a78ae2293b5fc6f5f04056d410a0b556d08511cd97a50a3d7622b
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 10816 bytes
SHA-256: 866b90ceb01e09a33a860a1b0b167abaec8f2fc9a1f016e377ea25198e93ef63

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