Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95d29ac15316a85…

MALICIOUS

PDF

83.7 KB Created: 2021-03-31 13:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b88c42967221ee6bd24f9b65c7a13a1a SHA-1: 91eaaa52b90bce5629b2202331329f23d25d13f8 SHA-256: c95d29ac15316a85c0a7a7785919bbe6ee9e55e8983fa3acc1a69dfc3d7b5d82
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a high concentration on disposable hosting and potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

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
  • 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://golowaki.ru/award?keyword=author+s+purpose+worksheets+middle+school+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449788/normal_605d5b6f5aeea.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/1071254452.pdfIn PDF document text
    • http://itactical.xyz/duseginosk5z5n.pdfIn PDF document text
    • https://sozamevojor.weebly.com/uploads/1/3/5/3/135309273/bixijovofilemepedes.pdfIn PDF document text
    • http://viewcreditscore.info/brookstone_big_blue_power_speaker_manualb16h6.pdfIn PDF document text
    • http://winfreeiphone.xyz/54035112046ifybs.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/navy_advancement_results_fall_2020_selres.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_6050c36714cf5.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/4048001.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/5ffc84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fd08e6c78808.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/faxibetovuzivaxexiwifef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/bikaner_full_hd_video_song.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_8acd07ce68e54c519d1710d30cf77efc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retisovojor/77103367503.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/coral_reef_formation_in_india.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_5260aced9bec449fbaff61ec491f9dfa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/alberta_provincial_2018_equalized_assessment_report.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_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 5328 bytes
SHA-256: 3c39bb163edd8a8ea45022878293975a59c23cb77cf96472c4634fa6d66a6072
font_01_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 11552 bytes
SHA-256: 8c16719460570a4df531bdee1e15aca50d24687b4a12628cb196a6fb67159f53

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