Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d5f566a6eb80ed…

MALICIOUS

PDF

72.2 KB Created: 2020-11-09 22:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ae39175f57553a9c32ed40c7a712ca6f SHA-1: d38edaf11132ec4e36333a5ef6509efbc39a11f5 SHA-256: c6d5f566a6eb80edb2404e576295ec23c35db58e87643008a8cb400ab0da8fe5
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 0.9997

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?keyword=secondary+economic+activity+meaning PDF link annotation
    • https://mogazikazalag.weebly.com/uploads/1/3/4/4/134440800/xuvokukuxiruviv.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/vekikovelezazal.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/2157324.pdfIn PDF document text
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/9495167.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/genedesowul/graphing_linear_functions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d96096-bb3d-49f2-b659-0bb00280a411/bluetooth_noise_cancelling_headphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2e763c-e74b-44ec-a552-8dff4ac9176d/75786141834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e57edc-ce10-4f7f-be59-5c06898e63ff/pebaxutuseli.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/codehs_answers_javascript_and_graphics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c22e152-f547-4b22-aba2-b73d59e8faf6/hydraulic_valve_symbols_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d468b50-d58e-4dcb-8d18-39d82e1a88b4/new_balance_compression_socks.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 5316 bytes
SHA-256: 376784d7a7c1bd56983c63529de0af4a7aaaf19f95493681b95b027c90630d11
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10412 bytes
SHA-256: 42ff8fa1a60501280864834786eac3799f528c8dd74ae99ef281ec39a7c972eb

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