Malicious PDF — malware analysis report

Static analysis result for SHA-256 088afff7372ccc6a…

MALICIOUS

PDF

80.5 KB Created: 2021-04-04 04:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6c49c4e968ff87c965392ba977ad6123 SHA-1: b5dffe3686fb3e985fbab5a09313bb6ed8a08f45 SHA-256: 088afff7372ccc6ac12cbf7c2854f6ed02958d3053dcda269c89846ba5adfc7d
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document contains a call-to-action lure, suggesting it is designed to trick users into clicking the embedded malicious link, which likely leads to a phishing page or malware download. No scripts were extracted, but the presence of malicious URLs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=spay+and+neuter+clinic+near+me In PDF document text
    • https://cdn.sqhk.co/xavonepez/ATDFfjj/89398826456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_5fd94cd62f897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_6039b7973f9bd.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/pleural_effusion_diagnosis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406776/normal_60087a61240d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_603700826dd5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff0339321494.pdfIn PDF document text
    • https://cdn.sqhk.co/zapakolozu/thbhiYC/ski_boat_drive_shaft_seal.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/aV0jcic/57927318089.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/54945844010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5fd13df0a3b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_6011c82b8f8bf.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
    • http://zisukuvi.atwebpages.com/gozikekuf.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_10446b28431242b49d7bb13615b2eaf7.pdf?index=trueIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/36493561375.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/is_deed_of_covenant_necessary.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/brothers_songs_masstamilan.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_fb69d69585354c2a8f2eae1452e6475d.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_98555860fbaf4943a0363959a0349faa.pdf?index=trueIn PDF document text
    • http://jabodegodonirad.atwebpages.com/preparation_of_p_bromoaniline_from_aniline.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/61439697789.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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 5020 bytes
SHA-256: 28cf9a7213e1f1d6555fca02c628d0f1c69f170ed74430edd4cf16a121f71f94
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 10896 bytes
SHA-256: 31a22d53431ced340debb346900c601acf19608b14da435ca2a6ce276fc72558
font_02_sfnt_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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