Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c9d02ccc0f0cc6…

MALICIOUS

PDF

85.0 KB Created: 2021-03-28 11:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b0bd108a3d9b876a6391f404d11db91b SHA-1: c8b4d53a03d202a279db4a7450d78250118ef402 SHA-256: a4c9d02ccc0f0cc6c77c34dc4c95b14131c97b55616242ef840788c919ca51fa
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a significant number of external links, with heuristics indicating it functions as a link farm hosted on disposable domains. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/123?utm_term=hanuman+chalisa+cartoon+song PDF link annotation
    • http://milktree.store/how_to_fix_washer_that_is_off_balanceabsfk.pdfIn PDF document text
    • http://hookup756.fun/nawumajevadejusoxiwokifpzk39.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/ijyeoDW/xivimulewomewu.pdfIn PDF document text
    • http://arthromedshop.xyz/926666763674it0c.pdfIn PDF document text
    • http://repaircreditscore.info/magnavox_universal_remote_mc345_codes_for_sanyo_tvwea2s.pdfIn PDF document text
    • http://uplrezina.site/7a-_8_crossword_answersf77z7.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/pieMnTW/bhakti_song_dj_remix_2019_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/gjh36HO/picture_background_color_change_online.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/fhhhfhe/53788021327.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/eGs8gH1/82190482301.pdfIn PDF document text
    • http://look-hotel.com/sims_3_cc_male_skinny_jeansnf0tz.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/ZJszhcO/reduce_alchemy_time_bdo.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/cdqighi/zombie_army_4_dead_war_pc_price.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/bN2gcXH/xokijukidukej.pdfIn PDF document text
    • http://pink-echo.club/85594737452efeht.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_35e0ec3764e44914be7043e2f1005854.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_b86e29ee77cb4c80aa5027e4aa2b6e22.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_9a80c64094e44e449e08c417785c1af4.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_59e10020828b44a0ae8e513abbed3044.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_1fa954efa21243d8890ab4ccfad0b325.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_f4578925fd7f4a78b4f0ef9a1852e36e.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_e2f60817a70b414e8fcafb2df40f41a1.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 4940 bytes
SHA-256: 65a1085adc6082dc3abb0b67af6df9042f88813bd25c53eebc0b9872346c68d5
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10804 bytes
SHA-256: 07b98e8dc792743f1ffd48e8ee45c9b43e74eabe4c80080aab4f287e8b17fe7a
font_02_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_03_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 3256 bytes
SHA-256: 9643227f1c6fe5f85ccdc300abfdba94b32ac2491107132e9244d5e7aa2084bd

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