Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74a6aab7bf0a028…

MALICIOUS

PDF

68.2 KB Created: 2020-12-17 17:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d5cbc80a4097622d744ee118a91124f SHA-1: 135149f8a11027639d2efa948fbbe3653d8577eb SHA-256: c74a6aab7bf0a0280116a9105a4002d616529c93616ff1be97bf003f7ded5e2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of the primary URLs, trafftec.ru, is associated with a search term that suggests a potential phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=american+union+state+flag+kaiserreich
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/4506487.pdf
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/biwafejewebu-megixogovur-mabod.pdf
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/fazifobisas_rapibipe.pdf
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/4427cb404a.pdf
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/damapidavugaxedom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59aab4ef-dc25-4428-984f-2f7e4fdd373e/54906900723.pdf
    • https://static1.squarespace.com/static/5fc4cb0188c99b6d37c032fb/t/5fce3544662d5e24e0cd7a4d/1607349572899/truck_driver_city_crush_download_for_pc.pdf
    • https://s3.amazonaws.com/xanebavifamopez/wikikanokudifarusiton.pdf
    • https://uploads.strikinglycdn.com/files/cebbf0b5-a16b-4988-94a7-3789350bcbb2/38968230107.pdf
    • https://s3.amazonaws.com/wekibik/69733695393.pdf
    • https://uploads.strikinglycdn.com/files/4a134f3e-76d1-441b-b33a-67d7e0c23a9e/31997803829.pdf
    • https://s3.amazonaws.com/widetunipet/43723319256.pdf
    • https://uploads.strikinglycdn.com/files/4f8d518e-baaa-42b2-af96-fc1ddaec4fdc/55004469759.pdf
    • https://s3.amazonaws.com/bomupi/12968867700.pdf
    • https://uploads.strikinglycdn.com/files/db104e7b-c70c-4418-95cd-fd7936f137a6/say_it_right_ringtone_free_download.pdf
    • https://uploads.strikinglycdn.com/files/636cfbbe-76c8-4c43-96eb-64184000b5c2/war_on_the_saints.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_off0000ce40.bin
63974aba44fd7612b082bd72788f8eadd32a6634bed9de1ce5ef3fd3de53e100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 5348 bytes
font_01_sfnt_off0000e041.bin
3ffe5210a399850eadb3163595b125aaf58f98537df121e67ecb5d7ef6173366		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 10448 bytes

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