Malicious PDF — malware analysis report

Static analysis result for SHA-256 a777d2a4d3f537d0…

MALICIOUS

PDF

75.6 KB Created: 2021-03-04 02:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 98112e4cd9f945729a29acccdc930e35 SHA-1: 6536d76c3a29d861fa85ad6313e6941f3a19c6a4 SHA-256: a777d2a4d3f537d021c1533ee5d99edf5dbc8f86dae4819f8ee69c80dbc2755a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('pelibifir.ru') associated with a 'Starbucks reusable cup iced coffee' keyword, suggesting a phishing or scam lure. The PDF also functions as a link farm, directing users to various other PDF documents, potentially as part of a broader distribution network.

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 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://pelibifir.ru/award?keyword=starbucks+reusable+cup+iced+coffee PDF link annotation
    • http://bellissimo.online/43729597817zphp2.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/mujebig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fe9f956738f7.pdfIn PDF document text
    • http://centerbluebadge.com/45344267997bx3nq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60206d4fdafab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5fe866293e96c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483103/normal_6000b2dcb4af8.pdfIn PDF document text
    • http://kinorio5.xyz/speaker_test_code_for_androididdun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_601dbe262e33b.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/bupijila/basara_heroes_2_apk_ppsspp_android.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/why_are_tropical_storms_found_near_the_equator.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/oz_lotto_prize_guide.pdfIn PDF document text
    • http://puxetixunelotaz.epizy.com/activesheet_exportasfixedformat_invalid_procedure_call.pdfIn PDF document text
    • http://pojafuda.rf.gd/plotting_integers_on_number_line_worksheet.pdfIn PDF document text
    • http://kefujaforu.rf.gd/70898755906.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/73083393579.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 5456 bytes
SHA-256: 42d1abf4e54d9cd036654d2d27078abde77034216d480aea6658840204b11547
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10196 bytes
SHA-256: b3aa1a45fbe9480f58f80198630505234a583cba8f3514adfe2cc3bc43e5b1cd

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