Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f305cf0e4be47ef…

MALICIOUS

PDF

80.5 KB Created: 2021-03-28 07:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fa27dded50641e5421f6678be3e749e9 SHA-1: 58cd85170e8904a6a5a5f9477b7ebac1b97d6a4c SHA-256: 7f305cf0e4be47ef8804668036abd7d7fef52fad1c48b579b425f6043e42f76e
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://xajibur.ru/123?utm_term=hungarian+rhapsody+2+sheet+music+musescore PDF link annotation
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/zeditim.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/frases_del_principito_y_la_rosa_en_frances.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/darudi_vapazupofamiget_fifotava_tivanotone.pdfIn PDF document text
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/lukifaxolil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405639/normal_5fe136d6134f2.pdfIn PDF document text
    • http://haustova.com/73780425176taqnt.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/xokojakezenobefawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_6038249145b9c.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/rome_bus_linesdhu4v.pdfIn PDF document text
    • http://tuxiwos.iblogger.org/zozonak.pdfIn PDF document text
    • http://limaxinsto.xyz/why_is_my_pressure_cooker_not_opening2yxkn.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/lixuzo/14252757826.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_142a12e886ff48209e6230a5e2b27327.pdf?index=trueIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_165cb78848594df28b91269e18bbce43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/subnautica_prawn_suit_guide.pdfIn PDF document text
    • http://lujotuxubegu.rf.gd/fitbit_flex_charger_not_working.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_66c35444fcdb496da98cd2bdba212681.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_0b7148b71c4d44b382bf21de7b9435cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/6281155134.pdfIn PDF document text
    • http://xuxusemo.epizy.com/79575176529.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_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 5648 bytes
SHA-256: b14d282afac3da5ade93e6618454107ceb12efc57a36175c0bb182dd4e10ef32
font_01_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 11516 bytes
SHA-256: fabe5408217d72cb11a956677dd73a2b1d7bf4ff1a5a9839e2645cea41316279

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