Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc1af6bf28da7e1…

MALICIOUS

PDF

83.1 KB Created: 2021-03-21 02:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6df29a7eb749fb56afaabd3e6c315a83 SHA-1: bc33692e6e33981ae695531192af7784f1fe9dfb SHA-256: 6bc1af6bf28da7e1e616002732c5d5f6f353bcbaef683b1985ea713cbb68f55a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to benign-looking documents, but one primary URL, 'https://golowaki.ru/123?utm_term=assawoman+bay+crabbing+report', is flagged as unknown. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or distribution mechanism. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=assawoman+bay+crabbing+report
    • http://hihikane.space/nintendo_wii_u_virtual_console_games_listuv2f7.pdf
    • http://tronreserve.online/59651235675hizoh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sedowedi/genie_model_7055_wireless_keypad.pdf
    • https://uploads.strikinglycdn.com/files/30dda161-bd61-4535-990c-c877be1b9055/26246539739.pdf
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_d96265d9932b4a3dade1fb43f3a13ee7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccb8673c-cf0e-4908-bb4d-10e17ac4a815/pabufibemezivekim.pdf
    • https://s3.amazonaws.com/zumomasugipeno/does_mal_die_in_descendants_3.pdf
    • https://s3.amazonaws.com/vavapekadoliti/wunatusupujixeve.pdf
    • https://s3.amazonaws.com/gisujubolidine/whatsapp_gold_apk_2018.pdf
    • http://vetisuduxujin.epizy.com/72487870475.pdf
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_4ed6cd06ed034882b3475d181a45074a.pdf?index=true
    • https://s3.amazonaws.com/wutisigila/sijuwivezuju.pdf
    • https://s3.amazonaws.com/buxoparadazegu/43901782361.pdf
    • https://uploads.strikinglycdn.com/files/b30c017a-553d-4af7-a37a-8fc38eeed1db/what_kind_of_oil_does_my_troy_bilt_riding_mower_take.pdf
    • http://wujuxupizosafe.rf.gd/game_templates_unity3d.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_d662f7d888cb48a38bb791f7eb6b1deb.pdf?index=true
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_8b79357cf7424ca3be026756b382f22c.pdf?index=true
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_72ed851569b4405f9835e179b7f62fbf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48e8cd83-b923-406a-b369-e4110539c37b/12283544782.pdf
    • https://s3.amazonaws.com/xixonu/65456434246.pdf
    • http://daduzafez.epizy.com/identity_theft_report_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010567.bin
bb0bc101a18349947183a84973d39e9d5d76864f33cb62481b1fd0345ba8ab48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 5544 bytes
font_01_sfnt_off00011849.bin
f07ad3d4d93105406d30cc204d77664fd20777b92bc029257843e545a2c21dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 10928 bytes

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