Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf281e85258b316…

MALICIOUS

PDF

82.7 KB Created: 2021-03-12 06:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c3165fd8c5e09078e14464713fc93e11 SHA-1: f9099a3f90c5ae42a0d3e936091b756361a737f3 SHA-256: faf281e85258b3167bef2125ccd0bd4a5ebe798ed4960f374ef8ace518225448
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing SEO-like keywords in their URLs, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://mezovuduw.ru/wix?keyword=proto+rail+paintball+gun+manual PDF link annotation
    • https://wigojakumadofef.weebly.com/uploads/1/3/1/6/131606024/tojelaxowelexozukov.pdfIn PDF document text
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/7005621.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/f15115b48be3.pdfIn PDF document text
    • http://pezozolagipiv.22web.org/pujozowipipipuzatuluxowu.pdfIn PDF document text
    • http://bedomukuruxe.22web.org/acas_gender_pay_gap_reporting_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidarixek.rf.gd/how_to_put_pictures_in_a_photo_album.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_99784a56019e4e6c9b8028ed9e7b5c73.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_78cb620589ff41d28b9eb8c4619b43c4.pdf?index=trueIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_3e6002aacb574d09b4e5153e4721cfec.pdf?index=trueIn PDF document text
    • http://pidifuwamofuw.epizy.com/jolanerorewivife.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_68a6498945244fa5919ba140827f4909.pdf?index=trueIn PDF document text
    • http://vakisetituli.rf.gd/novel_bastard_devil.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_e096df7fe8ac4a688f66d1ea2479b1d8.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_5886e1255db94be4880506b86b90a6fc.pdf?index=trueIn PDF document text
    • http://wilixafex.epizy.com/33719500964.pdfIn PDF document text
    • http://jajowisomipuw.epizy.com/new_bhojpuri_movie_2018_latest.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_91735a98d7d24ae08e1508030c1694fe.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_b78ba4252b0c452b89c8cebab998eea0.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_8cec97ae676542dfa1c2a826e3d35da9.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5100 bytes
SHA-256: 91e103485ff2edfc4608c5646c6eb26d9bf612b342b734008097cdbb68d53d01
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 10288 bytes
SHA-256: 1ca22c2a94c8c8a06c639e609f101cd6577c087018ead79bbec475cf78b404e4
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 16124 bytes
SHA-256: 2d28dd8d55906943ecdef0e06c16de40d023931e7c445e737a75b065090ba680