Malicious PDF — malware analysis report

Static analysis result for SHA-256 d472baa291de97fe…

MALICIOUS

PDF

78.5 KB Created: 2021-04-20 03:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d207ae00673d7ff1b288aa3795d1dae2 SHA-1: 81777c90a64bc0e6e79a3630bc897af9333125c9 SHA-256: d472baa291de97fe555be931d9eab6bedda3ec1fe4b9dbf8ad6b2aee89142ad2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://pelibifir.ru/strik?utm_term=japanese+textbook+for+beginners+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fe0a766e56f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_601253ddca028.pdfIn PDF document text
    • http://lofoluwa.iblogger.org/risk_assessment_of_power_systems_models_methods_and_applications.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_60013ea2bbcaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fdda44fc8788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_604cd9421e9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_60644a67b8cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_606a76e940f55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602c0cb608ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_60332a54a64fd.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/nuxulikiwab/doralenowukutokavumizi.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/jafuxavawimisivuzinabed.pdfIn PDF document text
    • http://nanedizuli.rf.gd/pdf_file_sample_free_download.pdfIn PDF document text
    • http://duvugagaxanawag.rf.gd/mukav.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/zidel.pdfIn PDF document text
    • http://goseletew.epizy.com/29948243409.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/dadamol.pdfIn PDF document text
    • http://nepokeda.epizy.com/76566952241.pdfIn PDF document text
    • http://sebafasoro.epizy.com/angular_7_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • http://nematamaduwos.epizy.com/judesewowaked.pdfIn PDF document text
    • http://baverasoge.epizy.com/how_to_repair_a_keurig_b60_coffee_maker.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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 5440 bytes
SHA-256: 2036966cd313f9826b54822d596eb6ccafb47c6d68f245d91dfb20b28016b3a6
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 11144 bytes
SHA-256: 1575afed14103aa3e120ca83f847a0168bd47d12f486fe82f06ac7ea3e797601

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