Malicious PDF — malware analysis report

Static analysis result for SHA-256 959fe2eb1e71bb93…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 20:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 71f53449b97985625689212c8b1c28d5 SHA-1: e1424cd6f5d39bb754293158530761bca86bb518 SHA-256: 959fe2eb1e71bb933e91b336092a1a9a20e1a876c215df076005ece16409633c
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to technical issues, directing users to the identified URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=how+to+fix+service+battery+charging+system PDF link annotation
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/928413.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/gisitejisewuj.pdfIn PDF document text
    • https://zimosamizafokox.weebly.com/uploads/1/3/6/0/136091721/5d4cfa57cb0.pdfIn PDF document text
    • http://twitter-center.com/88216988961b1dpe.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/bibpFie/hard_rock_greatest_hits_of_the_80s.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/b6f54c1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5fe9efd39fd7c.pdfIn PDF document text
    • http://lg-copyright.com/xirenujudopiwuzobosujesejruob.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/zOgcIgd/90357679738.pdfIn PDF document text
    • http://ewwe.space/ladki_beautiful_song_badshah_mp3_downloadmez98.pdfIn PDF document text
    • http://reawont.online/loxumemomodedudubegexizixhgp8.pdfIn PDF document text
    • http://it50save.info/how_to_fix_samsung_a50_not_turning_onz0fy8.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/gedexim/south_indian_breakfast_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/2284731319.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/91091645059.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/endospore_forming_bacteria_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/gapajepogufavipofoz.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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 5684 bytes
SHA-256: 2f0d079bf1e2502087adea7fcef7ae82f3888e4a48c42e863474487244af75d9
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10212 bytes
SHA-256: 55ac28c84fd2b999742a81d0ad84854be16c59bef0e09d729260578f8434e4d0

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