Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c11ef911c2e22b…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 07:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c59328c38b393595fbb5b30aa5adcdc2 SHA-1: d784e27c9c7798bc21e25058cbef214e959b0b33 SHA-256: d3c11ef911c2e22bfef0764fe9a306d7c0c722cc1d452442ae62e96f45aefaec
186 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 6

  • 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 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.
  • 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://xezojetit.ru/123?utm_term=multiplying+two+binomials+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368954/normal_602455f115c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_604cff6965363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5ffe4d047123f.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://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_7c84360dda1c434fa9a509477796b862.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d78fba8-9ab1-4611-a36d-73f4297c3f32/bissell_powersteamer_duo_2-in-1_steam_mop_pads.pdfIn PDF document text
    • http://gomanezobovo.rf.gd/frigidaire_oven_replacement_parts_near_me.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_9a0321273f484f44920986ae829caeb6.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_1b753758af444fa4b55a020980445572.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffde624-76c7-493d-9457-400b2667af6e/52064485114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e54951-b331-4ef2-b6c2-4027b171e481/pazokut.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_97539b322dff48ad99a26830ec9a1b2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiniruru/excel_separate_rows_into_sheets.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_2baca4567b87462296768a8ea1673a65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/phosphor_bronze_chemical_composition.pdfIn PDF document text
    • http://numivonef.rf.gd/9047134913.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/agreement_on_textiles_and_clothing.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 5516 bytes
SHA-256: 2a8370d72ff61f468dc239f52384e8c1c21e966b720431e2c3a37fc51916a013
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 11668 bytes
SHA-256: d411997f1b8b99fc6564dc5df5eea62aa3fd4ce14f54f8df2e87b6d1b5d4959d
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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