Malicious PDF — malware analysis report

Static analysis result for SHA-256 46920aee1506f528…

MALICIOUS

PDF

83.5 KB Created: 2021-03-06 20:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d13c72757ce8f360b81f38b227c05c19 SHA-1: fecb65031800ea9f8edc74e1ef793ff8c2469a4d SHA-256: 46920aee1506f52882e8747d4b5ac8fe7c6f9fbfcf058d2b1edcd66d2f2616a5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of malicious links suggests an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=ap+style+guide+numbers+1-10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd26627a0fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5fe3fda346ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482208/normal_603bb78ba4369.pdfIn PDF document text
    • http://lnstagram-office.com/nupujosevijulz1j9d.pdfIn PDF document text
    • http://stav-games.ru/download_faily_rider_mod_apk_versi_terbaru_20201w0nm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fc7c558c865a.pdfIn PDF document text
    • http://hookup157.fun/haynes_manual_toyota_aygoj3bi9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384472/normal_5fee647f6c7d8.pdfIn PDF document text
    • http://noksipals.online/zisanepanofo36j4u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413969/normal_60438926b14cd.pdfIn PDF document text
    • http://rentline.pro/the_walking_dead_book_16zncud.pdfIn PDF document text
    • http://philonio.online/gemumigopopos0kdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5ff130b40ce29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_5fda1f65a5207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_85f384de42ea4b1abe45c3a9008878b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/710b6147-1d67-48bb-bdd8-ea9ce744ef5c/domakasitukezadojebawe.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_da5f4bf6daae4975b6e0e2b44cd3ceb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb14021-f90a-42c4-aa37-21753b9717d3/jadefemodutowen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 5300 bytes
SHA-256: fc71530e02fd92736a639a168c053693c6befed2a33e9a71715f73efff97f8cb
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 11144 bytes
SHA-256: 054a0358762beece217c18a6f0a1f0012e1f92cee0db4e727cb447fc8c726b7e
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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