Malicious PDF — malware analysis report

Static analysis result for SHA-256 6161cce88c84fbe9…

MALICIOUS

PDF

73.7 KB Created: 2021-02-19 17:37:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a7c4d581c468c279f394eed95e06ae91 SHA-1: a852b6b8b2d14735b9b52a46ac173dc95a4af27c SHA-256: 6161cce88c84fbe9dfd3a1b05acdd5654f5aa1d4a12b9b53f532823cd73749b0
206 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a callback lure heuristic indicates a potential phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/wix?keyword=cmaa+exam+study+guide PDF link annotation
    • https://cdn.sqhk.co/xeposetuge/jmidihV/ritedudejupikikub.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/7a934a.pdfIn PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/9314635.pdfIn PDF document text
    • http://leree6.club/audition_1999_english_subtitlesubl4r.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/Djaihid/touchgrind_skate_2_mod_apk_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/EnhgiHL/17574787606.pdfIn PDF document text
    • http://onsideball.info/sidokalatisejuvokaw0dgc.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/jbo9jgz/archery_bow_and_arrow_set_price.pdfIn PDF document text
    • https://vijuvunido.weebly.com/uploads/1/3/0/7/130740607/lulidojawufemezifax.pdfIn PDF document text
    • http://subikizivuwen.22web.org/data_analysis_using_excel_tutorial.pdfIn PDF document text
    • https://mifevulesitiz.weebly.com/uploads/1/3/5/3/135321383/zarukotikufukid.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/ghiihaU/wadabazesogivu.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/icT5yji/20601077441.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/5hhiePk/10880573949.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/hibdIhf/entergy_number_near_me.pdfIn PDF document text
    • http://xxlmature.site/addition_worksheets_for_first_grade8fff7.pdfIn PDF document text
    • http://aycotoro7.xyz/kanubujojapifenomaneehhhm.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/vjifjae/my_bowling_3d_download.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/wufujudisu/formation_affaires_reglementaires_cnam.pdfIn PDF document text
    • http://gexazavere.epizy.com/bevetavow.pdfIn PDF document text
    • http://bekabugi.epizy.com/82868782425.pdfIn PDF document text
    • http://pelubameta.epizy.com/gazimumava.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 5092 bytes
SHA-256: 98b9acc6f7181058fed723ee0d57e08566fe54fd1d8f2fa18ede596b1836a57e
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 10192 bytes
SHA-256: d6a7e7054bd4ef4ed22a451a17315126f8431f0823f443100b9cff9602583e49