Malicious PDF — malware analysis report

Static analysis result for SHA-256 211ad4ebd3dbd5b5…

MALICIOUS

PDF

76.1 KB Created: 2021-03-10 07:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7665cef03a4dfc25b8eaec514f4076db SHA-1: efc112bf99310a984b1413e0335cc5c199a9ecd3 SHA-256: 211ad4ebd3dbd5b5caf7c93b449465af63cbc22d91b9ce11e51c5e5276e1f183
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with a primary focus on `https://midufefew.ru/award?keyword=cariotipo+xyy+pdf`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=cariotipo+xyy+pdf PDF link annotation
    • https://fitovixuzo.weebly.com/uploads/1/3/1/3/131380078/xifodabusaxafarazoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470545/normal_5fed697d90d96.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/EMijFhi/day_r_premium_apk_ultima_version.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/gcjahgk/monster_truck_driver_3d_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fde7bd25eca6.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/tonalotipev_susakitiput.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/ijaicie/1000_island_dressing_sandwich.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/756fff1dbcfb60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5ff803e729215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_603919321c893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_5fd817680671c.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/3886f1925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_6011b4084d80b.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/lawakux/zidorikemegoxewuvewumuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccf4d1e-fca2-440c-b8b2-934c0cafba56/ariens_compact_24_engine_oil_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/ashrae_psychrometric_chart_si_units.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/learn_korean_alphabet_comic.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/romopatiguvegivovapomosuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abeb6f8-e711-4ace-a0b9-0e9f085ff401/les_miserables_musical_review_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6001af67-9f98-41c6-ba6b-4535e94d1f99/5_dysfunctions_of_a_team_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1114b87-2ceb-4184-b7e7-25bb509cce63/martin_luther_king_jr_entire_i_have_a_dream_speech.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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 4900 bytes
SHA-256: 8cd2d5d2319873c74cf17b32a733a5084616760db876bfa96a0b61d3135279af
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10292 bytes
SHA-256: 68c643156210ea6228532a744aa558cf666f620108cb5ecc12a5a6c146a87a4b

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