Malicious PDF — malware analysis report

Static analysis result for SHA-256 8021f4dc163d6436…

MALICIOUS

PDF

83.7 KB Created: 2021-03-09 06:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a976dd24ebbabac73f19344213b3196 SHA-1: b092a7342661b0f00d18db039922de41946ce77c SHA-256: 8021f4dc163d643673d3544d7e960b30e1343b055d1042dfac26b31463e71e89
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

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://soxebez.ru/award?keyword=animator+s+survival+kit+pdf+portugues PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6024b0bc64196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6024b8846b476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_5fd1e82f3875b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411231/normal_5ffc72d11a725.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/pretty_little_liars_the_perfectionists_netflix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fc738b0b9d59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5fe17a03c126f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_7b30f089bea34047b1326c1eb5220a89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sevoga/mehandi_circus_tamil_movie_ringtone.pdfIn PDF document text
    • http://voxavupe.epizy.com/search_a_document_for_a_word.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/86731641249.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_efb167cc787d44748b7e851989a1e630.pdf?index=trueIn PDF document text
    • http://sizikipap.epizy.com/86701777709.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/sarah_dessen_someone_like_you_read_online.pdfIn PDF document text
    • http://jexoxitisujoj.rf.gd/boldly_i_approach_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/is_ki_a_compound.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_193591c4323f4955bf0a6a6bd80a9fea.pdf?index=trueIn PDF document text
    • http://fusupufe.epizy.com/double_pipe_heat_exchanger_cost_estimation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 5356 bytes
SHA-256: feee7ca87744079ce08055f3c2d5ba2fea41add9c1e66bc07df9371cf19b67b7
font_01_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 10652 bytes
SHA-256: 82a9e15cc96f276681ec426cb05de4444d7bcc99cf868c33bf12e4cdcef3df10
font_02_sfnt_off000133ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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