Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc92519ec0eed7d8…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 12:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fbceafa98d723463b7928d49b0873025 SHA-1: d3fb6d4ffbc07bdb97c662131e7e33b264245c56 SHA-256: fc92519ec0eed7d83a51277eb29a0d4ce257ef79948fbb27f8b7ecb7a60bd8c7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains that are part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to academic research, likely to trick users into clicking the malicious links.

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://xajibur.ru/award?keyword=effects+of+social+media+to+students+in+the+philippines+pdf PDF link annotation
    • http://help-lnstagram-verifycopyrgiht.com/war_horse_breeds_in_indiagifvk.pdfIn PDF document text
    • http://makamar.tech/bonevejizenitofemekw65b8.pdfIn PDF document text
    • http://telukobipafe.iblogger.org/mijuvavatozubopajejogelek.pdfIn PDF document text
    • http://busivel.xyz/cyclitic_membrane_formationc8ul4.pdfIn PDF document text
    • https://dewapapowirise.weebly.com/uploads/1/3/1/4/131438248/tixavab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_602e4ad8377e7.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/cHijhj5/metal_shooting_action_games_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_603052734d51e.pdfIn PDF document text
    • https://cdn.sqhk.co/pamoguto/5hbldE5/zipalani.pdfIn PDF document text
    • http://fruct.space/does_3_day_potty_training_workksqh2.pdfIn PDF document text
    • https://tudiputowol.weebly.com/uploads/1/3/1/4/131452732/dc69b3ba03c.pdfIn PDF document text
    • http://efarbok.xyz/pac_man_championship_edition_2_ps4_trophies09wvs.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://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_0050483e5d2545f5a53ea992cd5334d9.pdf?index=trueIn PDF document text
    • http://rimutapewite.rf.gd/sumabaxonipirukil.pdfIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_24ef448863f849a582c2987544ce9bd3.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_26bee91c97604a7caf91128bd8b30c29.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_dfbdd27828b84ee58b2317f00b7ec365.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_d60835684a904fe2baabd21e5d7fa519.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 5140 bytes
SHA-256: bc6695e4bf61156fc693b77f7fbed6dec021b8619cab7f71d7ac115e97b7ff54
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 10200 bytes
SHA-256: 1be74fa75433906d313256af7ab932219023ec687e00d645e60e94b2b12caf9f
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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