Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4d24b6b13e7cb3…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 13:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: de4aeaafda4fb792a889dd9e42a6d0e1 SHA-1: 25c791073819e588ffaf53309176101ea18f7a39 SHA-256: ae4d24b6b13e7cb36bfdf5c7af66af2489b0c96561ab10e57a7e99c0901d555e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, https://jacksth.ru/wix?keyword=20%252F20+linda+brewer+analysis, appears to be a lure. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=20%252F20+linda+brewer+analysis PDF link annotation
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/bixaxajapogagaj.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/XhfELij/stickman_rope_hero_3._3_mod_apk.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/venowabofeten_xemifojoji_sidoxetur.pdfIn PDF document text
    • http://nanupigib.22web.org/best_bible_study_for_engaged_couples.pdfIn PDF document text
    • https://tanorejenajid.weebly.com/uploads/1/3/1/0/131071151/c59f3bf13.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/zarejopulesilav-sunasiludodabim-rupijodokasi-fekedajaji.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/jidgeft/tanizufufikoxaviworivegux.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/4192131.pdfIn PDF document text
    • http://vuvowepo.22web.org/jenobejunaf.pdfIn PDF document text
    • http://mapovepajosoxub.iblogger.org/vsco_apk_full_unlocked_2018_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezavirofi.epizy.com/memory_palace_technique_recall.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/games_2019_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/transformers_g1_blaster_vs_soundwave.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/bogorevobikus.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/personajes_mas_importantes_de_estados_unidos.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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5368 bytes
SHA-256: f4306524256109c31ed5d0b22b156102e16b51c1667c2466c773ad52976253ff
font_01_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10124 bytes
SHA-256: 3085be92551570030e7425e76d4d9c9aa0be4912ba8ce7880385361448fe059e

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