Malicious PDF — malware analysis report

Static analysis result for SHA-256 756fb1d193b7d917…

MALICIOUS

PDF

73.7 KB Created: 2021-02-21 08:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4dba82cef856889bc45b86b9fd939f3a SHA-1: 733e9b1cf5e438231b3a749ed667071661dd6eb9 SHA-256: 756fb1d193b7d917138a4d262ebebe08300619b7475c2396840097baea2864af
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://baarspo.ru/strik, is flagged as suspicious and likely leads to a phishing or malware distribution page. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://baarspo.ru/strik?utm_term=winning+chess+strategies+pdf PDF link annotation
    • http://figojusu.iblogger.org/58677773789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5fcdb2114c06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_601042b735e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5fe8279372b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd5f7f34afc4.pdfIn PDF document text
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/e4fb3ee3e6d746a.pdfIn PDF document text
    • http://barbanapoli.moscow/dilajezixokumqxj1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojajopi.epizy.com/briony_fer_on_abstract_art.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/45276575311.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/13118741502.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/pinwheel_seventeen_piano_sheet.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/5459663209.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/15792826165.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/fannie_mae_home_possible_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/25084498015.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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 5396 bytes
SHA-256: 35b1f393815a814a65a4c9165eea07efddc36aef64b87bae969bcb985ef0e056
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 11748 bytes
SHA-256: d104f7261e990df3b4e8fea04da282acfedb579eed3ca2ce1068cd63ccca5102

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