Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bbd3584f86ea95…

MALICIOUS

PDF

69.5 KB Created: 2020-12-15 17:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf07d737bdf1abfe303d26c9abe5f65a SHA-1: 78b61d7214d96af70cf48f7f22481c1a5293adba SHA-256: 77bbd3584f86ea954530064d34f34b848a4fb669da2c296dceef16127b5a7f4a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with critical heuristics indicating it functions as a redirector and a link farm. One of the primary links directs to a known malicious redirector, and another points to a large collection of PDFs hosted on Weebly, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=vampire+lord+summoners+war+review
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/podoziz.pdf
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/5bf58af78f21.pdf
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/mejaderolabuvuv_laxikezedit_temerunuvowive_rivoke.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/01d639fec09.pdf
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/768546.pdf
    • https://wanezetisozol.weebly.com/uploads/1/3/4/4/134468493/kuvogitafiduxavuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/satudifin/2014_mustang_gt_automatic_vs_manual.pdf
    • https://s3.amazonaws.com/mijedusovineti/ximigele.pdf
    • https://s3.amazonaws.com/julexekubaj/chatterbox_template.pdf
    • https://s3.amazonaws.com/dupula/tedilijomabamozowetize.pdf
    • https://s3.amazonaws.com/vinivuxo/fraction_tiles_chart.pdf
    • https://s3.amazonaws.com/rogugagatuf/clinical_coding_workout_2017_answers.pdf
    • https://static1.squarespace.com/static/5fce613d0356d927d7eeb529/t/5fd73132dca22152605bed17/1607938356108/25_anniversary_logo_vector_free.pdf
    • https://s3.amazonaws.com/bededuxotulapil/articles_all_rules.pdf
    • https://static1.squarespace.com/static/5fc56d376b97992eb57a16b7/t/5fd72cf9dca22152605b9b68/1607937273882/cellulitis_with_bullae_formation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce2.bin
972266f6dad20551e93be0654995b4ad64ee70493185cc04b9a58474e09db7fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 5220 bytes
font_01_sfnt_off0000cea2.bin
07e5a124f7f3c3c97acd4bf0545c99356ab612d027a5d31cad969fe6c2fe780b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 10844 bytes
font_02_sfnt_off0000f40f.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 16092 bytes

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