Malicious PDF — malware analysis report

Static analysis result for SHA-256 734ed80ed055a94c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-06 22:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3e60ac3e051baad8555494816d52f36f SHA-1: 88b822b9acd498437e24478467ee0b90f96fb087 SHA-256: 734ed80ed055a94ca268c143fc75599641155abc34d4635378c2d1a3a3b444d1
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical PDF link farm detection and ClamAV. It contains numerous external URLs, with one specifically identified as an external URI. The presence of a link farm suggests an attempt to direct users to a large number of potentially malicious or SEO-spam websites. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://botokaw.ru/award?keyword=voice+warm+up+tongue+twisters PDF link annotation
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/54d44f87453.pdfIn PDF document text
    • https://xenuwupe.weebly.com/uploads/1/3/5/3/135329542/dd1d9cd7369.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/molodiz-pidatoximuno.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/what_to_make_for_lunch_at_home_indian.pdfIn PDF document text
    • http://pimuxiv.22web.org/pediatric_bronchitis_treatment_guidelines.pdfIn PDF document text
    • https://golujubomo.weebly.com/uploads/1/3/4/0/134017735/mekemofemimam.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/pevejibelizu.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/govowujojugive.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/1926978.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/brother_gx_6750_typewriter_correction_tape.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/f9d097ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/section_2_direction_and_location_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/a5_brochure_template_psd_free.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_640118f9487d496987d8c9f58a359174.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_c7668c351b5d44d99a05505ab0070e14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/53605290729.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_04763894279b4db3bc2f0345416dd248.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_462f2b967bd44a38972b02be2ccd3c7a.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/denon_x4000_ebay.pdfIn PDF document text
    • http://tudutov.rf.gd/facebook_cover_design_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/what_does_1020_mean_in_police_talk.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/80306235369.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/58941283231.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 5280 bytes
SHA-256: cc8761261eb89e03c9ec8b803ef3d48a5b0e4d009ecb8dd74bda0b951981f18f
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 10328 bytes
SHA-256: ec927cf57fc6b5dd001c2f17d6452789d757f96019a29e23b9cc27149badb0f8

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