Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f7f7cae19f7882…

MALICIOUS

PDF

77.6 KB Created: 2021-02-14 06:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4b9430719e1eca0215ccd2a7755fbe31 SHA-1: ea0eb2f440c29a9a8579b3075fe74c71a09dd2c4 SHA-256: 03f7f7cae19f78828af9e5ea5e88f28b858197c75e1d427bb5b14b783cf0d126
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files on disposable hosting, indicating a link farm or distribution mechanism. The primary purpose appears to be directing users to external content, potentially malicious, under the guise of search results or document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=bible+dictionary+pdf+free PDF link annotation
    • https://depularo.weebly.com/uploads/1/3/4/6/134601330/3ad702c23e.pdfIn PDF document text
    • http://shmelev.pro/bulidomojexuzujexepovahgden.pdfIn PDF document text
    • https://sevakozo.weebly.com/uploads/1/3/4/6/134677934/4fcffc1b8e9532.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/mukimalekazuma-madigewusoduko-likuzegafa.pdfIn PDF document text
    • http://pesale.pro/android_bindservice_flags6qxcb.pdfIn PDF document text
    • http://prizinsta24.site/can_and_could_for_requests_exercisesf9tek.pdfIn PDF document text
    • http://xulikugo.iblogger.org/97471181486.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/5660681ff16e.pdfIn PDF document text
    • https://poxejoretojav.weebly.com/uploads/1/3/4/7/134740271/gikogixajevifa-lasazul.pdfIn PDF document text
    • http://kudretbozaci.com/gloomhaven_class_guide_three_spearsp4vcx.pdfIn PDF document text
    • http://all-system7.club/34437939685fojoq.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/shrek_2_torrentay6ty.pdfIn PDF document text
    • http://vkysnaya-eda.site/650343047306gw2i.pdfIn PDF document text
    • https://xiresipi.weebly.com/uploads/1/3/1/1/131164504/pivakebat.pdfIn PDF document text
    • http://ewwe.space/tudidabubunukimuxapuwalozndis.pdfIn PDF document text
    • http://xploitcrew.io/52363489105ycji3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talagolow.rf.gd/wadilolube.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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 5260 bytes
SHA-256: b5e59c0f0be10c1cb5b3134071eb28973df5cb777cede10b42c311c01c2bff14
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 10712 bytes
SHA-256: 27dafed7f96370bc747fe9e73f3be7fd9007edf335c3251b6c4ca7903656b717

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