Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fbdce328a2f07d…

MALICIOUS

PDF

66.7 KB Created: 2020-11-27 12:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b981c62c115842826d311d0ec585113 SHA-1: 18ed012e2a4edf7d4982f8309a0552aa9342c50a SHA-256: f5fbdce328a2f07dcb8d5ac89a72b257e5b184545167d582c348bc6933e67d3c
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. One of the primary external links, https://traffnew.ru/strik?utm_term=lumex+lf-2020+lift, is likely the malicious payload delivery URL. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/strik?utm_term=lumex+lf-2020+lift
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/4f047.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fb6da4683e5c.pdf
    • https://molusodufewi.weebly.com/uploads/1/3/4/4/134465793/6ddf0cb.pdf
    • https://guxewegitonis.weebly.com/uploads/1/3/4/3/134336720/d03c32cc0.pdf
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/xilofibeda_mivanuva_sefukivok_nodafikejeze.pdf
    • https://cdn-cms.f-static.net/uploads/4425483/normal_5faab96b037bc.pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5f8fdd5edbbdc.pdf
    • https://sutisivanopazar.weebly.com/uploads/1/3/4/3/134310164/movona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tiniruru/kikizolokon.pdf
    • https://uploads.strikinglycdn.com/files/f7efb0b8-1149-4b07-8f00-8998b8b54f26/craigslist_chicago_illinois_free.pdf
    • https://s3.amazonaws.com/sorapobuk/assamese_calendar_2018.pdf
    • https://s3.amazonaws.com/tomaxade/85173977738.pdf
    • https://s3.amazonaws.com/nademopor/79010309014.pdf
    • https://s3.amazonaws.com/tifuwuw/manual_operador_industrial_de_calderas.pdf
    • https://uploads.strikinglycdn.com/files/5ded06fa-5c8b-4b1e-aab1-8a551f099512/mujamulumanowifowuz.pdf
    • https://uploads.strikinglycdn.com/files/6ca8f27b-9310-46fd-9e26-5086f9dc9523/gadoxusup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c773.bin
4bd757d5460fb68a5f8e90c6eb9dff37a9aa4d0623d8909263140b5a6fc7dbea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 4744 bytes
font_01_sfnt_off0000d79b.bin
a2a1052cc5002b51539fc6c7e45d2734434337051d7d4725e25d834dc35a017c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 11312 bytes

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