Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7a640701b4581d…

MALICIOUS

PDF

98.4 KB Created: 2021-04-06 13:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a547e1fdea70444d580001e742a4ae3f SHA-1: c344194fb87813932045fa659323162770ee847c SHA-256: 5a7a640701b4581d4e194015d2bb5baa930190384a1570c23e2b3bbedee8c362
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body, though heavily obfuscated, suggests a lure related to 'case in point pdf reddit', likely intended to trick users into visiting the malicious URL for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/award?keyword=case+in+point+pdf+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455195/normal_603f787c6883b.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/excellence_punta_cana_dominican_republic_reviews.pdfIn PDF document text
    • http://xinegibifupa.iblogger.org/79291994380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5ff110bc7bf34.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/70078604129.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/angular_2_interview_questions.pdfIn PDF document text
    • http://bufo.online/70277268806se1rr.pdfIn PDF document text
    • http://proita.space/rekogagodwqxqz.pdfIn PDF document text
    • http://noguwizipipolom.iblogger.org/zivemeg.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/pipofawuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5ffe065aab386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_60294c562049c.pdfIn PDF document text
    • http://leon-stavki.info/how_to_pair_my_disney_circlemom3y.pdfIn PDF document text
    • http://vereffka.xyz/15315729736y2qfi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_601260e0e936e.pdfIn PDF document text
    • https://www.caseinterview.com/http://www.acethecase.com/https://www.preplounge.com/en/http://mconsuIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_9b2b96290bfa44bb9a78dbb11644fd26.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_608f046795aa420eb3dae6155b7df943.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_3fda0c2aa19b42979585334845fc48d0.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_3c3acbbda57649ba8567f5663c2e1bba.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_d9f8fcc7d81b431f850b3b93335529fb.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/zulusizalemufew.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_off00014319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14319 4908 bytes
SHA-256: 6268fd654e903c0d48ac05f78def500cb49df2b2e0b1a98f4c57d3f600041219
font_01_sfnt_off000153d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D6 11764 bytes
SHA-256: c10ed3d1a78cb69bf4d857687d68a2d2d518bdabb438efc40edd2e1336a0638d

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