Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52bc7cb509e8663…

MALICIOUS

PDF

79.0 KB Created: 2021-02-26 11:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 15f0d5520d9ae289df2fc02522c142bc SHA-1: 09f3f25a81a7f7e73dbd8ceab300ce8999998727 SHA-256: a52bc7cb509e8663dba3d41bd3677613969b5496e17a16287d3837db0616822a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=love+poems+for+husband+anniversary PDF link annotation
    • http://joxorapux.22web.org/capacity_building_training_report.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/fhf1gfT/ben_10_alien_experience_download.pdfIn PDF document text
    • http://lajipuv.iblogger.org/how_to_file_a_lost_phone_claim_with_verizon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_60308d9d6a891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_600c7c88ee01c.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/hgghids/loruwokufuguginawaz.pdfIn PDF document text
    • http://jaxarupilej.22web.org/dedudefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5fc6b4b96569f.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/gjiaNV7/lego_batman_2_dc_super_heroes_money_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/notokulojow/hijhhgf/nipojomitosefupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5fdab000bf9d7.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/visagogijulep/18408934440.pdfIn PDF document text
    • http://watokugen.epizy.com/architectural_drafting.pdfIn PDF document text
    • http://numowun.rf.gd/formosa_taffeta_co._ltd._annual_report.pdfIn PDF document text
    • http://dosunadis.epizy.com/xinokitoresanegedififo.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/18386468669.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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 5492 bytes
SHA-256: 5904b542e8ac4292759de056e143a7b1850f12b5f3055884e4484677bbde3acd
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 10496 bytes
SHA-256: 87ea364d22ef4e29063fbaa845928b1bf85f15ee88f274e0e66e5f5800f3e5c6

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