Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfc5b8aedcaf43c…

MALICIOUS

PDF

82.2 KB Created: 2021-03-13 13:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3b755b8a4e37eb0086cb1c7c08df2891 SHA-1: a76855f5ab7d8109df23108cd542467b30388d1c SHA-256: 2bfc5b8aedcaf43c47d3c8949f64cbbc51abbfbb3bdf221f2e071492a044f870
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of external URIs and the overall structure point towards a phishing attack designed to trick users into downloading further malicious content.

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://zajinet.ru/award?keyword=database+interview+questions+and+answers+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449417/normal_5feffa3033141.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/32992737446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fcef4b1cf5ec.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/pharmacology_made_insanely_easy_barnes_and_noble.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/eueKicv/31796408093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_60315529ca115.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/3mKjfha/tokaido_matsuri_expansion_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_6049bdfe1d950.pdfIn PDF document text
    • https://cdn.sqhk.co/tasewapimol/88ndjcb/absolute_rc_heli_sim_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/gheghja/tajibamanuwojopefaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://menerolefu.rf.gd/fb_video_er_for_pc_windows_7.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_dc76f336c8e3408bbe0cfce9d2e27ea4.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_6a77c0d3a75d47bba0a7e456f15d1bac.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_a85e2da3d1da4596a3560a7566a3165c.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_b32b80476187497b838389d8c8e92d2c.pdf?index=trueIn PDF document text
    • http://zenejanewupuj.epizy.com/best_way_to_transfer_printable_vinyl.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_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 5452 bytes
SHA-256: 7f7d4c81e0e960decdf6a07b7c8b855524b45a535346ad23ae285eda0b951ec0
font_01_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 10636 bytes
SHA-256: 5e4ff302e71a2fb67fee7c797dfd06ba0c388c5ac062bf60c5d0b335a03aec53

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