Malicious PDF — malware analysis report

Static analysis result for SHA-256 f329cc736a8189cc…

MALICIOUS

PDF

69.6 KB Created: 2021-01-07 01:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0735974e3dae846d3eed5c26651fd42f SHA-1: 7a39e68608ed0a3ef49c878282502d6b0a1ae9ea SHA-256: f329cc736a8189ccf7f0caacafc34a4ec555f24308f0bf72aff07deaa8ba63b6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. One of the primary external URLs identified is 'https://trafficel.ru/aws?utm_term=android+10+samsung+s10e', and another is 'https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/wugovub_lezedozilolofad_rizudavatadi_fexalenugoge.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=android+10+samsung+s10e PDF link annotation
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/wugovub_lezedozilolofad_rizudavatadi_fexalenugoge.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/icPWqhc/losititekitazuso.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/7nDNjiI/78722879622.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/6d85e4abce.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/gupojakami/debarolexususuzuresed.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/letterhead_template_latex.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/airedale_academy_6th_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/criminal_justice_administration_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/pukapuxazigasum.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/kikibutinorimabake.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/important_full_forms_for_competitive_exams_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/puvuregekibivukixatonegat.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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 5296 bytes
SHA-256: d935528acddfdaed2be99ff8e1edd4877bd59e1951707fb99031986064665c37
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 10244 bytes
SHA-256: 73cf08b8675d3b7c5576dfe8e711b81b65aeb7085888820829a46f4591010cb4

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