Malicious PDF — malware analysis report

Static analysis result for SHA-256 e369de371c90d48b…

MALICIOUS

PDF

68.6 KB Created: 2021-01-03 13:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 91ff119e9cbcae2aef1512dceca02635 SHA-1: 6cfd66529f99c3205fd4daf5bfbe680dbb43e70f SHA-256: e369de371c90d48b77dd2dab0b2e6b668f676477701ce0efccf2a33134259319
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and is flagged as malicious by ML classifiers and ClamAV. It embeds external URIs, including one pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The presence of a link farm with numerous PDF links, some with numeric slugs, indicates an attempt to manipulate search engine results for traffic generation, likely for malicious purposes.

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://trafffe.ru/aws?utm_term=master+thesis+presentation+template+ppt PDF link annotation
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/ceab4ec50ea663a.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/CjjCghP/79164445131.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/ZchsFjr/premier_league_top_scorer_20_21_odds.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/hgwheic/losove.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/mofudoxi_xekosujak_xejupozeridew.pdfIn PDF document text
    • https://lajidusok.weebly.com/uploads/1/3/1/0/131070852/fc3f741.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/jufowokedunod/toeic_answer_sheet_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/bootstrap_template_maker_software.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/pumofusuwadokam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a35e92c-0d6c-4e59-a610-42334ff9bacc/elements_of_music_notation.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/bobby_hill_that_s_my_purse_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/android_bitmap_memory_size.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/growtopia_surgery_guide.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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 5064 bytes
SHA-256: 18fc092e061cbf93a64a39fcac591c523025ac122275c6f1df8c7830abf95a87
font_01_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 10584 bytes
SHA-256: 98aa57391f95c5ab6e0ddbf71c4c50d3e2a691f0ad5b9b672d93df2f70fab907

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