Malicious PDF — malware analysis report

Static analysis result for SHA-256 79caa309f2a07497…

MALICIOUS

PDF

65.6 KB Created: 2020-12-17 00:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 87f2c2f6caca18dc6d9290f4a9cdb4bd SHA-1: 96e7979e4709810785dbc7c3115c92b9ebf2eda6 SHA-256: 79caa309f2a074973ea83fb3f051b36eca3a034c307547fffaf357007f6d4d46
176 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 6

  • 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.
  • 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://traffine.ru/aws?utm_term=lowdermilk+beach+red+tide+report PDF link annotation
    • https://komavumi.weebly.com/uploads/1/3/0/7/130738531/masebo.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/tevubozezupozag.pdfIn PDF document text
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/kiwusosifegokexibaw.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/galuvopisa.pdfIn PDF document text
    • https://rugaxiloved.weebly.com/uploads/1/3/4/3/134305568/jotebomasekanil.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/228a3d3a-0d24-4cc5-a75b-447c2f6a2c65/batobo.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/death_of_salesman_sparknotes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfe343ca23154c95bb5f9/1606221365421/71137086021.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/64650379662.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/ivan_pavlov_behaviorism_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/73283287821.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d659d49dd1244740d42e/t/5fc55b0d61e25426e1ea6272/1606769422195/mode_in_r.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/suferofujonazobelulu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc524ccc30a162e0c6e112f/t/5fc7d2643e96977c29c6df80/1606931047963/sililofuli.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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 5372 bytes
SHA-256: ff160649a72cb131bf11ce36e81e0195933306b2ebe7c11a63dff39e0edfd148
font_01_sfnt_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 10812 bytes
SHA-256: e087524a61f11e65b80ec595f0e3d708d12527ef1dafbe39f98d8cc68bb6d76e

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