Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1552f5ffa3882f…

MALICIOUS

PDF

70.8 KB Created: 2021-02-07 20:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: dfa882a4c69718a230682d634e82ce2b SHA-1: 49456b427be510a8d6d5c07ef569a01b15211513 SHA-256: 9a1552f5ffa3882ffb4cd77743522bafbd5d0ef0afe7ae1a56c49edbdb99410a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=hunger+games+catching+fire PDF link annotation
    • https://cdn.sqhk.co/sofetarunox/WADkEjg/among_us_skin_pack_mcpe.pdfIn PDF document text
    • https://cdn.sqhk.co/dovumisiwe/c7jdheP/her_story_review_ign.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_5fec86e5df597.pdfIn PDF document text
    • http://babbieshop.ru/dragon_ball_z_androides_19_y_20k6wgh.pdfIn PDF document text
    • http://reassurez-moi-fr.info/zombie_army_4_dead_war_ps4_co_op6m1ik.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/heSlWhe/xemebekutal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_600e5d71cc184.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/susud-pefojax-sozelel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffe1cdb52b01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5fcdafb3107fe.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/7055c71191dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6019f24c0b30e.pdfIn PDF document text
    • https://kitomejefu.weebly.com/uploads/1/3/4/1/134108571/veburukineki_dotepom_sovoxerodawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 5224 bytes
SHA-256: 55d48afdb3b3a26e836eb231fc26fc598d1b93db944d0cfb47faffa38c12b8d2
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10496 bytes
SHA-256: 56437554d89533bb876016224b261ea80fe460ccccd3fcf74d16160791a184a3

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