Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c27cf10962db0b5…

MALICIOUS

PDF

70.5 KB Created: 2020-12-18 18:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 40596d2fcf9f4651243cc0518a62fdb5 SHA-1: d207538d52d880101de71492a8ea103be754561a SHA-256: 6c27cf10962db0b596d211ab659f2968123bef32f3808048ab467feed1820a04
156 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'trafftec.ru' with a search term related to night vision monoculars, suggesting a lure. The PDF also contains a large number of external links, with one pointing to a suspicious S3 bucket URL, indicating a potential link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

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://trafftec.ru/strik?utm_term=bushnell+night+vision+monoculars PDF link annotation
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/nulapusepiwezu_gixovojaz_noxedup_xoxuxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_5fb51be4acedc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f967433b4641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f890d65d4a55.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/wanalovum/volekuduroxotoda.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/cursive_writing_worksheet_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/sifavegiwosezu.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/ee0-_1_pay_data_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/brownie_badges_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/92082347433.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/wusepu.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/cute_gacha_life_characters_made.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/boboiboy_galactic_heroes_apk.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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 5320 bytes
SHA-256: 64a0668a11765fb563ae9356c5e2a2b8feda4e793be83386fc9ea8be3e278e3c
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10752 bytes
SHA-256: d4eb2a8b0dd47e45a594ee733c7d31c6cd1229bb64c9380ef9610160968098a2

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