Malicious PDF — malware analysis report

Static analysis result for SHA-256 571cc6c251895c87…

MALICIOUS

PDF

69.9 KB Created: 2020-11-24 09:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a614706632d05780fa0354ac686fa93 SHA-1: 549cb605f4dc0047dfdee392ff0e21f019ac544f SHA-256: 571cc6c251895c879f74c89ee781441453ff2babb06bc06f070dbd6024ede5c3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files hosted on S3 buckets and Weebly domains, suggesting a link farm or redirection mechanism. The primary external URI, 'https://trafficel.ru/strik?utm_term=ba%25C5%259Ftan+%25C3%25A7%25C4%25B1karma+sanat%25C4%25B1+indir', indicates a lure related to Turkish content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of malicious intent.

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://trafficel.ru/strik?utm_term=ba%25C5%259Ftan+%25C3%25A7%25C4%25B1karma+sanat%25C4%25B1+indir
    • https://pigupapizot.weebly.com/uploads/1/3/4/4/134480908/5b34bc559a9.pdf
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/6b31216e1db.pdf
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/welusazefan.pdf
    • https://zefutijokizire.weebly.com/uploads/1/3/4/8/134868110/gezef-xunekomuzixade-wozogefex-kunav.pdf
    • https://memesuxiti.weebly.com/uploads/1/3/4/6/134635319/0a27b685df4f.pdf
    • https://tisikifa.weebly.com/uploads/1/3/4/6/134614219/sajamegad-nofamuxevige-mipawiv.pdf
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/1054157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/henghuili-files2/vikavozifuje.pdf
    • https://s3.amazonaws.com/vexeliku/alpha_project_dallas.pdf
    • https://s3.amazonaws.com/wilugugo/51050944530.pdf
    • https://s3.amazonaws.com/leguvefu/84431954415.pdf
    • https://s3.amazonaws.com/gelawiweza/free_admin_template_angular_6.pdf
    • https://s3.amazonaws.com/remuv/41055589563.pdf
    • https://uploads.strikinglycdn.com/files/31cf5e55-4ef3-46ca-9940-83005883c1b4/15995695659.pdf
    • https://s3.amazonaws.com/doxifuba/in_applying_makeup_what_goes_on_first.pdf
    • https://s3.amazonaws.com/nopomewegobij/32146721880.pdf
    • https://s3.amazonaws.com/rivazixexuguri/lysol_disinfectant_spray_sds_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f5.bin
4250919a7381bbef26011fa8637f48f6ec8d859e9faf62584f6c5842b9dbdbb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 5072 bytes
font_01_sfnt_off0000d562.bin
ead4b0556fc7c37d2e6b6fb8a946afe7b9ac77f8551a83c20a56487a20a5aa6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 11996 bytes
font_02_sfnt_off0000fac8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 4324 bytes

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