Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e78f5d5a0202e10…

MALICIOUS

PDF

73.0 KB Created: 2021-04-01 15:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 48369fab785b3fbe6f996edffff150ee SHA-1: a2cc688774c6117826e92e5101fd3223ce096776 SHA-256: 9e78f5d5a0202e1003f8327de809f771500ba4c3c27ee0811f1660dfe349bbf2
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection, indicating it is a phishing or trojan delivery mechanism. It contains numerous external links, many pointing to disposable hosting, and specifically impersonates Microsoft to encourage users to click a link, likely leading to credential theft or a second-stage payload. The presence of embedded URLs and the nature of the heuristics strongly suggest an attack pattern involving spearphishing and exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/tegato.pdf.
  • 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://mezovuduw.ru/wix?keyword=device+unlock+t+mobile+apk+download PDF link annotation
    • https://cdn.sqhk.co/rubupidorinu/s1egihh/dave_dangerous_play_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/iXnzqig/67268505306.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/QXprhfs/planet_star_wars_battlefront_2.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/fgfd9i4/89593074885.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/hvgcjbH/wigagisigemitiforijovu.pdfIn PDF document text
    • http://kprovk.xyz/diablo_3_ps4_wings_guidecfq1a.pdfIn PDF document text
    • http://aarbuz.space/duroid_5870_datasheetohlcr.pdfIn PDF document text
    • http://openplafond.xyz/bash_shell_manual77kvy.pdfIn PDF document text
    • http://fasumidivojasuj.iblogger.org/mkt_bhagavathar_video_songs.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/tegato.pdfIn PDF document text
    • https://cdn.sqhk.co/losegiro/jiirgcF/4932933335.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/makowemegafotelafa.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/ghdievH/rizovopexuvafarodowijilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f500022-dc32-4e6f-81dc-d4df56654e6b/jean_hampton_hobbes_and_the_social_contract_tradition.pdfIn PDF document text
    • http://peregal.epizy.com/uc_browser_apps_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9940a3c6-e480-4890-86f3-d2a1c542c391/manual_de_gramatica_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee8d2ae-162d-4fa3-9cc0-33835d9217cb/what_is_the_closest_synonym_for_the_word_chaos.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5300 bytes
SHA-256: 961d0f4db512278421e9ae1b337853742fd1a0dc5d90cdf765097cf9a4175aae
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 10236 bytes
SHA-256: cd9cc467d79ebaf798d5cf8d926404ee675dba9462c23878db2a4ed590790804

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