Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c78c0331fdbccaa…

MALICIOUS

PDF

73.7 KB Created: 2021-03-16 09:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 592e0d6ee4fee4390200a36867b822ed SHA-1: 7a98c06f82c46c0d85cc62f4cc96d9c7ee8b879c SHA-256: 2c78c0331fdbccaa36aeb3344a4d1a784b033ffe430fb5ceb2e84e56731b968b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The primary external URL, 'https://baarspo.ru/award?keyword=telescope+history+pdf', suggests a lure to a potentially malicious site. ClamAV and an ML classifier also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=telescope+history+pdf
    • http://ebay-coupon.ru/vubinobizomeripomefyynco.pdf
    • http://khareedforosh.com/zuwunigovuwesojupojahksck.pdf
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/kitofemediboxil.pdf
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/bagapamikapubi.pdf
    • http://menbp.online/public_health_101_healthy_people-healthy_populationsq7m2m.pdf
    • http://zawizazoxof.iblogger.org/que_es_una_imagen_tumblr.pdf
    • http://lavka-karamel.ru/39002927726e8tw7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timeziso/guided_math_workshop_2018.pdf
    • https://s3.amazonaws.com/redegelesibif/e_tv_guide_saturday.pdf
    • https://s3.amazonaws.com/tezude/48491160164.pdf
    • https://uploads.strikinglycdn.com/files/95e1cc3d-852d-40cd-9372-2cd8a851c0a3/vezelovijisekolorov.pdf
    • https://s3.amazonaws.com/tugabijenovili/4839459829.pdf
    • https://s3.amazonaws.com/rivazixexuguri/algebra_worksheets_grade_8.pdf
    • https://s3.amazonaws.com/nabifovu/soroluwanuvijufadapipajob.pdf
    • https://uploads.strikinglycdn.com/files/4fad790f-3230-4949-a9ee-183108db9370/joxutevipesexokenesum.pdf
    • https://s3.amazonaws.com/gonima/all_marvel_movies_list_in_order.pdf
    • https://uploads.strikinglycdn.com/files/852c7f31-e066-4ad8-9b43-dc2fc70bd149/92151490951.pdf
    • http://kebipilukav.rf.gd/biblical_theology_books.pdf
    • http://zovixis.epizy.com/como_descargar_antivirus_gratis_para_android.pdf
    • https://uploads.strikinglycdn.com/files/32859aec-5874-4de2-b5fe-ffd021a7c7c1/steven_bragg_books.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ba.bin
27c9213b8d78f8256c58b84353d2c814d76513f6f12e923e2fd6c8e7fb61c383		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5084 bytes
font_01_sfnt_off0000f40d.bin
121851cb7d3c75949b1556a8f4795857177cd9929214f1a3d3f79416d29a4b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 10624 bytes

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