Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c7ea81f14b7c76…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 15:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bcf1c5522eeb5f57b315e5ec0729681e SHA-1: 51f549512a39d003a765c994b99e1e0f22504ff3 SHA-256: f2c7ea81f14b7c76d696ad0f8bb3f7930baad0b195eda652c3bea53597a0c78b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to direct users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/award?keyword=speaking+pet+cambridge+exam+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378621/normal_601d8a0647587.pdfIn PDF document text
    • http://buxeletifexid.medianewsonline.com/young_and_freedman_university_physics_13th_edition_solutions.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/58ded472ff8dc05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fd6444096c8f.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/2708356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_60514ac33b5af.pdfIn PDF document text
    • http://rinusiwujegabu.medianewsonline.com/wiraluverowavimip.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/goloragino.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/bae566a6fb.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/loneminovu/xopofibamokek.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/pancreas_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/whats_a_dead_star_called.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/procreate_ipad_painting_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32333a39-1327-4ebb-aa02-9c0e336a62a1/the_all-american_slurp_multiple_choice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3079b0b-cc76-4b41-994d-66fa98821477/what_is_the_oil_to_gas_ratio_for_a_johnson_outboard_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/56680313700.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/godasifu.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/questions_and_answers_a_thousand_splendid_suns.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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 5320 bytes
SHA-256: 3337087fbaff82fd5e499d2bf6d2e3253639dd8217afa2f86653c565a64f2f11
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 10520 bytes
SHA-256: cab52deaa584f042058709935596d474311d246cb873a911e49b4da0c56ac7a3
font_02_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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