Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ca1888a644f83a…

MALICIOUS

PDF

67.0 KB Created: 2020-11-23 10:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7aaa51f71d2c018d1853e1f6e1340de5 SHA-1: dff7c3f66f1b4de790bdb16407413c20245be2ad SHA-256: 38ca1888a644f83af234819d6c8a75d38bfc846c1d3da4cf0fa0f0abfa74f66c
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://traffset.ru/123?utm_term=da+divinci+innovative+sound+and+bass PDF link annotation
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/seladijolubo_pevoxosun_nijonosi.pdfIn PDF document text
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/toxujub_pugozax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fb8a72d40f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5fb6a6ea45880.pdfIn PDF document text
    • https://nibojesuko.weebly.com/uploads/1/3/4/3/134329062/mozolemexekozolu.pdfIn PDF document text
    • https://vifixizunegivu.weebly.com/uploads/1/3/4/3/134349865/50af17f0.pdfIn PDF document text
    • https://lawilutimi.weebly.com/uploads/1/3/4/8/134879912/fasasu.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/modowor/e_major_scale_guitar_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092ac960-5a89-4375-a125-e71873f8307c/90928661618.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/lumberjack_outfit_osrs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7188f2-d859-4007-8b02-ef11fe286c90/how_to_draw_cartoons_for_comic_strips.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/white_pages_brooklyn_iowa.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_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 5004 bytes
SHA-256: 1f41fe6fc19474b23ecfa076125d5acdd1d1b00c66a7dd4dab00342013d3009c
font_01_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 10532 bytes
SHA-256: 669aba0b567a8e590eaa0935e678e02e89049277258863045ff47aa411668a0e

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