Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ffdff7124385d3…

MALICIOUS

PDF

66.0 KB Created: 2020-11-29 02:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 566913f6f8f5fc0628ff0e110230106a SHA-1: 1326091978a3061f4690247c39693da3b6cb6707 SHA-256: 31ffdff7124385d30b307d1ca40450d20d92eb42bad1adc04baf640127465497
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, indicative of a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=red+werewolf+hunter PDF link annotation
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/xekoguke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_5fb556d494afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5fa9ff9eb2e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f89cf8cd23b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5f9056468f45c.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/zevutebulaworel/71566121504.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/hiroshima_bomb_blast_video.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/42848327530.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/rejection_letter_after_interview_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/abbush_zallaqaa_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/bolero_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/62147267878.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_off0000ba99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 4540 bytes
SHA-256: 43d5bf1b72f4b028b00468f969b8783080ebe8656809b72111ec2441da2d6f29
font_01_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 10336 bytes
SHA-256: dcc4a208c293679ca6a297fcccd39c2432c967db09d938406394f9980f8999d4
font_02_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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