Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1365cb8a3d52647…

MALICIOUS

PDF

64.3 KB Created: 2020-11-23 04:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f41c368322bb358826400d99e8749f3e SHA-1: 187d9fd7dbf84a032735387818d4111bf30ae110 SHA-256: c1365cb8a3d52647206de948c2279806ca53b3b429e657668d62b707ea53777c
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=paratransit+application+sf+ca PDF link annotation
    • https://dafanifupo.weebly.com/uploads/1/3/4/6/134645493/roduzutimavorum-vafalad.pdfIn PDF document text
    • https://jevusesapa.weebly.com/uploads/1/3/4/7/134765100/vatanu_pisasi_panup.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/bejaf-dimenulinuzi-noselekazeliz-najub.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/1050702.pdfIn PDF document text
    • https://sigudajofabi.weebly.com/uploads/1/3/4/6/134679089/ziroxigafaworukinolu.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/pekesadumukubiberu.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/sabitifubuxasenu.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/nofezokepafepilufusi.pdfIn PDF document text
    • https://bemozazowomema.weebly.com/uploads/1/3/4/6/134668792/palox.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/fekuxupa_sedej_lifumo_neriwejijojixim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d0a332-4c14-43d5-97bf-155d86965238/tuzujakimom.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/converse_return_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/linear_functions_domain_and_range_worksheet.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_off0000beea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEA 5008 bytes
SHA-256: f77ca370e96796a4dc1585b119752f6e8e93bb8f90ccbfc72414e2d3cdfa2978
font_01_sfnt_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 10788 bytes
SHA-256: c2b81785a06c602722243567d28d941c3e161fadfda87f72dd5683131a5d1897

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