Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f03fa7b5b2fe3c9…

MALICIOUS

PDF

82.1 KB Created: 2021-04-16 20:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: de3eb358b6ba33e19b0c92f8dc9e3c96 SHA-1: 92415e077f18bb0f869199fe4b052843d544d9de SHA-256: 1f03fa7b5b2fe3c942ff20324fdd5bc6bc5c52fee6240080fa5a2912380fb9ff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=pathology+books+for+medical+students+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466996/normal_603f57028bc16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_60437161a760c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5fd1eb76d4848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_5ff45700bddc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5fc61dac2ed83.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/ochbibl/paper_toss_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jakadamalate/eFHRiaw/sagovexenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_60604f8a26493.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/wavunot/92032616100.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/cancionero_de_guitarra_para_principiantes.pdfIn PDF document text
    • https://83c30a2d-d83c-4020-88f4-fdb7bed8c9e2.filesusr.com/ugd/e59e18_5d4a1865adf243db940e7f19dc1e4119.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/zetebosivuxenanuroxulixa.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_0c813e85a8bb4835bc1831c3970825ce.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_23b5af3246c043edbcde765440983f72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/how_to_find_the_magnitude_of_gravitational_force.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_b47b2eccc9944ac48c246c0fe3adbbe1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/nanusepegikog.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_e709693284ca4f94b10faa13364f6fec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/62537304436.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_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 5876 bytes
SHA-256: 39a398fe43d1d2d6a8ee63a68697bfdafadd7883fe117fc06f22040d42d6b37b
font_01_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 11720 bytes
SHA-256: 329451cbc317bcbe4d4fa95586781bc869e636d25dec71cdf7f25951211b4dc5

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