Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24aabaf46349562…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 20:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30fef628231e7df52630b4116acf3332 SHA-1: 03ba995d97ffabb2274ef4cebe2599bd2f819a6e SHA-256: a24aabaf46349562f9d3833d49bbc05ef23372a9b20c028c1ba95eee07ca0117
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'Psychoanalytic theory definition in literature' to entice users to click the embedded links.

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://jacksth.ru/strik?utm_term=psychoanalytic+theory+definition+in+literature PDF link annotation
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/7912893.pdfIn PDF document text
    • https://nugenezeni.weebly.com/uploads/1/3/4/6/134632238/9709988.pdfIn PDF document text
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/jufulugivagiguw-dopudukozipum-dogexebo.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/geijNhj/68894054925.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/1466170.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/fntzjsh/mokefaruzu.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/vgggHjd/74117831141.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/fgggfKv/colornote_app_forgot_password.pdfIn PDF document text
    • https://cdn.sqhk.co/xamubana/hijiDgc/72884039552.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/iiJNRBv/call_of_duty_world_war_zombies_trailer.pdfIn PDF document text
    • https://zekabijixakosu.weebly.com/uploads/1/3/0/8/130813896/vonoruxakika-nasimap-sinevejijigu.pdfIn PDF document text
    • https://dalujukonuxuda.weebly.com/uploads/1/3/1/1/131163933/poruzuwutakomaviba.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/sivaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/3IVNihA/free_gin_rummy_plus_coins_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/vipotukivisi/heViihe/kindle_shop_amazon_app_not_working.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/zufaxepixiguxax/gejusukemexusaliwuk.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_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 5212 bytes
SHA-256: b7c2eee1e0e5bff31fcf98eafc12eb93a5909b532f97c5a94377fe4f09e0dcaf
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 11152 bytes
SHA-256: 9cf929a45963a28514df4c818943190cb9f0fd8b65f55cb58260db58e6d59f97

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