Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ddc0b5e5bd0e7e…

MALICIOUS

PDF

66.2 KB Created: 2020-11-24 03:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 508458428fff384205918c21d6959ece SHA-1: 80666db1407dcc5db14f529265796a9162c6fd16 SHA-256: 98ddc0b5e5bd0e7e98c6c0d1a0bd8ba7ff970dcb7466a6b972b857b40f4394a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine rankings or distribute malware. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown URLs strongly suggest malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, indicating it's likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=3+minute+interval+timer PDF link annotation
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/2018562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f8cb0b2858fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f983f97d7e8d.pdfIn PDF document text
    • https://mufiwejugoj.weebly.com/uploads/1/3/4/3/134340856/mijuxajemaju.pdfIn PDF document text
    • https://tibaxasunoz.weebly.com/uploads/1/3/4/5/134589804/f64b64668873a.pdfIn PDF document text
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/5202260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5fbc41325e7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413735/normal_5fbb6b56e687b.pdfIn PDF document text
    • https://lifonupulov.weebly.com/uploads/1/3/4/8/134893434/c0d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5f97e547bad80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5f9cbf5e75e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fa103135e543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f8b30d5ab60e.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/mafavuzenoliki/allen_bradley_micrologix_1400_programming_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/reality_therapy_worksheets_for_adults.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_off0000c86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 4780 bytes
SHA-256: 74b7f8f9a774db54979908aeb3358636cfcea3fbc27dab94354be3b12be35173
font_01_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 10472 bytes
SHA-256: 456589ed17e60a3a0a265858cb2a2408062ecd01217b6dfacf30580a381f121a

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