Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc04acb9160868e…

MALICIOUS

PDF

72.5 KB Created: 2021-03-17 14:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7d8c77897e38444e10c71853323ca921 SHA-1: 4acc6458f95a520d883033d8a749291f8f44df47 SHA-256: abc04acb9160868ef877d5e6025c2434104a45ed1503e57b2f45b84d918e6bf0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'free robux gift card codes', indicating a lure for users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=free+robux+gift+card+codes+2020 PDF link annotation
    • http://yazansoft.com/akhiyan_song_of_mirza_movie_freeza620.pdfIn PDF document text
    • https://gedotelebuguda.weebly.com/uploads/1/3/6/0/136050260/demokasagojapo-pewamano-ribinozemekab-degib.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/3399611.pdfIn PDF document text
    • http://merishwheelrecords.com/tezugotagef6lwj.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/e9905692cc.pdfIn PDF document text
    • http://moymagazin.xyz/52742411450t4jxs.pdfIn PDF document text
    • http://vittorguxx.site/lulemamasebejogajulebeg9x01i.pdfIn PDF document text
    • http://originalhallyu.com/cold_bath_or_hot_bath_firstxqcl0.pdfIn PDF document text
    • http://kupufevi.22web.org/tubemisukevig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c44ec0-b945-4996-8e32-8fd9229b7f5e/how_to_fix_indoor_motion_sensor_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b7a319-5b03-40ec-95dc-f732a8e5360e/5238312532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9b97fa-b765-4158-bd2c-2b266ef7c9bc/37786293190.pdfIn PDF document text
    • http://tuvawewopuje.rf.gd/how_to_create_a_mind_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf511bf-6589-4b04-8837-577006f42c6d/kidde_nighthawk_beeping_l6.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_6df9e78f29b9413582f011d358da236b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4570e7-a0cf-4200-92e7-de96665e0d49/37254377981.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_d38130834af44d00ada02252538be49e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffc3aa1-77bd-4a52-9211-44676df8d4e0/nordic_track_skier_accessories.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_14f412333fc84ea99a781aabe8266908.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 5592 bytes
SHA-256: fa6512e94808581fce861cb7f080d0f3f62591afc69d6d0758e3d274c75e9446
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 11224 bytes
SHA-256: 4aa6009f3479e74f2765737f3255f1ef57739c5cc2001bd714a6f45a844f74b9

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