Malicious PDF — malware analysis report

Static analysis result for SHA-256 731916d028945559…

MALICIOUS

PDF

81.6 KB Created: 2021-03-28 13:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a13652e06552e38e0ae5608be3ba331 SHA-1: aeef819b393bdbd61f8d8642cfebc46cdda6d2a4 SHA-256: 731916d02894555930aa32d8d31388e48884bc93a326a2597ffe90540bdd96ca
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://crophysi.ru/123?utm_term=alumbrado+publico+guadalajara+reportes PDF link annotation
    • http://sweetmeet.online/iron_palm_trainingri3ht.pdfIn PDF document text
    • https://cdn.sqhk.co/gigifojorax/U3EJig6/crash_dive_2_game.pdfIn PDF document text
    • http://scriptbook.xyz/losugujotazepulutajinz0p5.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/iiicDKF/gk61_mechanical_keyboard_yellow_switches.pdfIn PDF document text
    • http://erogan24.website/67617665804x2fxo.pdfIn PDF document text
    • http://cleaner-inn.club/roku_hidden_channel_codesbql1e.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/giAu1RP/current_freeway_closures_due_to_fires.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenilu/jhDieLu/entropy_piano_tuner_manual_espanol.pdfIn PDF document text
    • http://begetus11ppz.xyz/deadlands_noir_swade6s0ai.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/8kgglha/mapleroyals_guide_assassin.pdfIn PDF document text
    • http://yesitalia.fun/20481897464umlqj.pdfIn PDF document text
    • http://xrootunited.com/how_to_change_pin_code_on_liftmaster_garage_door_openerfk7pv.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/novipaliwid/coding_for_dummies_python.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_19cf8101a7314eb2ad527e030a7d4fa8.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_df8e9425d9314fdc9099ee48ba10f294.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/buzovolelusizamadil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253c11e1-6a54-4d72-bc15-0acad927619f/kelafadibufosar.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_d4c6f6323685438f8570c0a2b43679c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/mefop.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_1756fdb1b68445b8a2bd539245cbf698.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df99d56f-8230-47bf-aab5-ea5b35acb274/tojewu.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/75932933528.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/audacity_app_for_android_phone.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_6a8d1bc0df94417490b561b8dee8abd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15da7344-dc40-4b63-be92-6166d2727243/what_supplies_do_2nd_grade_teachers_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815b5180-8f43-466d-a3e8-2a141f00e5ab/14602698733.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_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 5596 bytes
SHA-256: 5cbad8477300b7e5ff780bba02a59bd897aa55a5ce191758720ff215ed185127
font_01_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 12408 bytes
SHA-256: 9f63e8f4efcef7cd2ebed59b7941bffe8a5b11c1ab363cb51d0d85f12786c965