Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8ef074c008e7f2…

MALICIOUS

PDF

62.0 KB Created: 2020-11-21 17:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f5ef24c9ac17d17e48c6d9406d940960 SHA-1: 1a57df37fad10a7604eba1a7c3e8836685aa5c79 SHA-256: af8ef074c008e7f25ae44ac36844658f64ee05e4225188ba4c221f5c67a3047b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking PDFs on S3 buckets, but one prominent link to 'trafffi.ru' is suspicious. 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 structure suggest an attempt to redirect users to malicious content, possibly disguised as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/123?utm_term=cuisinart+charcoal+water+filters+dcc-rwf-12 PDF link annotation
    • https://kinijenu.weebly.com/uploads/1/3/4/6/134641264/e884bafb.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/3180753.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/tadovu/sportsman_s_guide_buyers_club_review.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/transformers_beast_wars_season_1_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/balanza_de_pagos_macroeconomia.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/the_plimsouls_a_million_miles_away.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/asp.net_4_unleashed.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/valley_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/python_3_string_format_bytes.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/picasa_web_albums_search.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/17656231303.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/apprendre_l_italien_cours.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/xarugarawapuwalu.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_off0000a99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA99F 5320 bytes
SHA-256: e82ffd9a9107e41f69a09ca14b896e1b2bf1d2e916966a782afda79ee44b4d7f
font_01_sfnt_off0000bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC9 9744 bytes
SHA-256: b312461f9f60e800898525394d4f96beef0b51d23c1ff60dc927e59dd27611f6
font_02_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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