Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafde05f5ea69e4b…

MALICIOUS

PDF

76.6 KB Created: 2021-05-22 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0fe73cc68f0c580ebd978f53a7da4c9f SHA-1: 233d2c7ab9a5efc206e7e80e1c10a36b22dd750e SHA-256: fafde05f5ea69e4b484e9190f97526aa5e0909d5d7eed0c9a86e164513c56872
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=simplifying+radicals+puzzle+worksheet+answer+key PDF link annotation
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/jamemuxa_zegajoze_xovema_furad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488133/normal_5ff9d301e350d.pdfIn PDF document text
    • https://bakigimos.weebly.com/uploads/1/3/4/3/134322269/vofipofevorumok.pdfIn PDF document text
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/8cc519feb345a.pdfIn PDF document text
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/ruzugulerima-finafejiviz-milexepi-gabanasofixal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_60312019b2eeb.pdfIn PDF document text
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/gofifiminuniperixegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fef6ab66935f.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/9c5ee64f-7e53-43f8-a9e2-a1346d38035f/what_are_the_different_levels_of_krav_maga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615c94ff-dae2-4609-a756-31e7c7533f73/88838417383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fb6dd5-f7d6-483b-9a86-c22fd03ed4af/31200781916.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/do_union_plumbers_make_good_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f493b009-2693-4c67-b48f-d0d7824e4b5f/fry_5th_grade_sight_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/flexible_dieting_meal_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efa1515-9904-4887-99d5-cf625495e985/vuxixujinotaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/kosutetoj.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/player_registration_form_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20394da-5691-4646-8d6e-eef01d6b81ec/como_hacer_una_ficha_bibliografica.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/no_signal_on_drayton_thermostat.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 5980 bytes
SHA-256: 903e1dea2781d3909e3f6416a3d8e40f300445b94b68401ced163c4e7339f119
font_01_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 10808 bytes
SHA-256: 44afdc269945b7e4ecd0261061ad60e2b669f0b6e70fb77e374202ada560cc3e
font_02_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 16296 bytes
SHA-256: 5663d8578250f824917609d3eb76e3efe1318610afd7b77be9e2258255c4b957