Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9ad55d5e4f2249…

MALICIOUS

PDF

69.2 KB Created: 2021-04-02 22:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 641b42b5ca2af5b81e452cfd033b25d0 SHA-1: 05d9591262b8b106e0304a13a26569fe9fd8c547 SHA-256: 7b9ad55d5e4f224955ec418a0b9bf46d9ca1d9eba31fef0d062156f5b4d2acfb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with several pointing to disposable hosting. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing traffic to various sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://resalured.ru/123?utm_term=upright+bass+sheet+music+pdf PDF link annotation
    • http://uber-global.com/63780514843lqt3w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_60032877b6f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_601e901f1764e.pdfIn PDF document text
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/7147099.pdfIn PDF document text
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/8556839336.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/3337061.pdfIn PDF document text
    • http://zespodsvetkoy.site/john_deere_mower_dealers_ukooz3o.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/norunubidumab.pdfIn PDF document text
    • https://lojapajarete.weebly.com/uploads/1/3/4/5/134521209/2896735.pdfIn PDF document text
    • http://lovepositions.info/101178217340uj50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_60399eff64e16.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/2f3b8a72-bb9d-438b-8f45-24e51d3b0c26/96149127081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750bc1cd-c147-423a-aa46-3c6b9c4211e1/woliromufewepowizaduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8263a50f-124b-47dd-ba77-e935dc024b1b/10_day_green_smoothie_cleanse_dinner_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca667ef0-cc17-44c8-81d3-e4070530d220/jofowesukimumugejituxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b61506a-7b2c-424c-865f-917adb37db25/60777719793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acfba5cb-245b-4231-8851-f206e3ac9aed/xiwolubibel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e66c59-d90d-49dd-af98-0e61d5be1c5d/wubosaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441a0e4a-2e28-47d3-9a33-baea693e512a/sagifuvo.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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 5668 bytes
SHA-256: 19b083dfc8c12cc569dec23d95b1bc9d340ffa12a6d5f2e781c431c96aa6b4e3
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 10532 bytes
SHA-256: 2cf58ebffc2aecc3cb4c37d0561c1f3bcc7638f29aff0f4914a209cb9b4a9c8f

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