Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fc7878a2710943…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 23:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cc86bd92ffad373aa3981b6f107b993e SHA-1: 126bb6ae599efd0dfa32da938b47ccad26e3a0a0 SHA-256: 50fc7878a27109436734d3d836e4511221cf655b527c85cc543779fe60a33b83
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/wix?keyword=google+forms+database+query PDF link annotation
    • http://samelike.site/subtypes_of_antisocial_behavior_questionnaireb861z.pdfIn PDF document text
    • https://wudusalulolatus.weebly.com/uploads/1/3/1/6/131606476/mewuba.pdfIn PDF document text
    • https://gowobokibisalo.weebly.com/uploads/1/3/0/9/130969305/4005369.pdfIn PDF document text
    • https://zudomizat.weebly.com/uploads/1/3/5/3/135308615/xavim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426814/normal_5fce0b5e0b628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5fdc57726c965.pdfIn PDF document text
    • http://sodahub.pro/how_to_update_matricom_g_box_qzt804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fe90ee42a2a0.pdfIn PDF document text
    • http://yesitalia.fun/bibagekopagomugiremutogel6u3pi.pdfIn PDF document text
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/suxuzapoji.pdfIn PDF document text
    • http://powerhdniy.space/how_to_pair_a_jawbone_bluetooth_speakerfjo4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5fc79d794f652.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/305410.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://s3.amazonaws.com/zifilobesumafi/toxoplasmosis_treatment_guidelines_idsa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0dd7cd-fece-4b83-9458-9d356d714d4f/bollinger_bands_squeeze_screener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621d3d8f-bd5d-4ede-9fd9-41877e0732e9/what_are_the_4_types_of_books_in_the_old_testament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4151b5f8-25bb-4513-a138-76991440a533/653411764.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/20150316124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ce7116-4208-42bc-bc8c-ba7d12273d72/rudumapikoniwana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf10a48-eb79-4afe-ab23-6888602fec95/52397828904.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/waxuwazalav.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/sectarianism_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1195cad-f47f-4eb0-8704-4a7b594749e8/bosch_ecosense_dishwasher_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004fa2d7-0b09-4565-9d3b-7231714cf75a/welcome_to_holland_poem_part_3.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 5356 bytes
SHA-256: 01d707f4fe5dfbf1320137b256817472668bdf7e69ac433449ec846280d43e14
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 11340 bytes
SHA-256: ea6d52690f0434f1118530a469421437fb308114760247bdc7276259143f0968
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3