Malicious PDF — malware analysis report

Static analysis result for SHA-256 accefa05ac95f841…

MALICIOUS

PDF

88.5 KB Created: 2020-11-07 12:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9958105f4390171cbf078820b3176b96 SHA-1: bb5a8dad8c9e9612c8a8d1c010cf74223865517e SHA-256: accefa05ac95f8414cbe46f8b79b200de222fa438d1f8494496a063f628b5a59
146 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 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 1.0000

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.
  • 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://traffset.ru/123?keyword=jeon+jungguk+bts+birthday PDF link annotation
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/2681ec0d4348.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/56417df19.pdfIn PDF document text
    • https://sozipufejelaj.weebly.com/uploads/1/3/4/3/134352325/wuzovofitowadozafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5f94703c4716b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f8d48548587f.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/fogibi/jigsaw_worksheet_for_high_school.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2398239-a243-4e13-91c8-c2faa78db8b9/98524340672.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/50060358936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc5f7e8-db48-4da9-a18b-3e3131ecad4a/80765646209.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/mutukegamaxomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b50d43c-57c5-4d83-8d74-c3d2dca026f5/vazisimikorifewimogoz.pdfIn PDF document text
    • https://wuxugovowufo.files.wordpress.com/2020/11/schindler_s_list_theme_piano_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 30228 bytes
SHA-256: 316a9e7d2c321918476d7eb897227f06ccfb57847a45e8c93f5682d64675f6cb
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 5428 bytes
SHA-256: 7ee8dd2afce07aab4581d7d6bc68ff761cbe1b48b2ff4a350c6f41d3fa45b685
font_02_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 11712 bytes
SHA-256: 821b89cd3905214809084a8640bc2f52dd3c030f9682753026e8f873cd954a12
font_03_sfnt_off00013f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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