Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a210437fd4dacc…

MALICIOUS

PDF

79.3 KB Created: 2021-03-10 04:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ad13d075a0d41781b6b5449f6d26b6cb SHA-1: 3c4405210da62380b5a548f128787ae0a1d65917 SHA-256: 10a210437fd4dacc34772acc1560bd884312425a6f89bc51d6b891d3de18b228
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a link farm strategy, embedding numerous external links, one of which is a direct lure for an ebook download. This suggests the PDF is designed to redirect users to potentially harmful content or facilitate further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/award?keyword=analytic+geometry+pdf+ebook+free+download PDF link annotation
    • http://giocodigital.space/12197150135iu2ga.pdfIn PDF document text
    • http://funomixukipiv.iblogger.org/46258074343.pdfIn PDF document text
    • http://remumedigudeja.22web.org/paresebixiwetigadugex.pdfIn PDF document text
    • http://levantegroup.net/88481849759z94b8.pdfIn PDF document text
    • http://misstourist.info/a_woman_in_berlin_full_movie_online_freem56xb.pdfIn PDF document text
    • http://smartcoin.design/root_word_mitosisae88y.pdfIn PDF document text
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/6397425.pdfIn PDF document text
    • https://zifekibovaliw.weebly.com/uploads/1/3/1/8/131871714/sezimovapefigala.pdfIn PDF document text
    • http://aycotoro5.xyz/viber_old_version_app51uib.pdfIn PDF document text
    • https://pibazamigudixo.weebly.com/uploads/1/3/4/0/134000525/rajalelasurolu_fimidodogug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_93749bd8f22048a39a07510c516395d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/what_are_you_up_to_tonight_answers.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_fd9f116162234a0a8b0bdaa9bbde9324.pdf?index=trueIn PDF document text
    • http://vofebajonunif.epizy.com/53757975719.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_977ebe66e4e94f4c834815c11f8ea50a.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_6d218caf029843de86a9d6793fc3c08b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/furugopuzibejuwov.pdfIn PDF document text
    • http://tudurafobazax.epizy.com/xivobizasudedukidiwep.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/logitech_mk320_unifying_compatible.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_e86332ec3aea41459a3a163de9886548.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_6bfd35b3e9854c579c2bb10b29172edf.pdf?index=trueIn 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_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 5684 bytes
SHA-256: 36c4c9c26a42b7bce428757fe99f6c5e4210cf46ff2c488c785dc9b80040d664
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10724 bytes
SHA-256: 08317f32a7d6404d180a8245b1e2eea9ea4317d72ae3db0eb068ab2bdc36e17f

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