Malicious PDF — malware analysis report

Static analysis result for SHA-256 83093cbd54033ec5…

MALICIOUS

PDF

77.4 KB Created: 2021-03-01 07:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31e1f6ed9b1a33cbb0193ad8c5c2face SHA-1: 3a20467154ec190bebb8efb5cfb729bea5d49542 SHA-256: 83093cbd54033ec5cbdf7243a182ba3e605b029863a675cd029cc339d1eb358b
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 0.9998

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 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://ponafet.ru/123?utm_term=snow+white+and+the+huntsman+unrated+parents+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450723/normal_6013027f71dab.pdfIn PDF document text
    • http://tamoxagutikesem.22web.org/checkpoint_remote_access_vpn_configuration_guide_r77.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/who_is_the_poorest_man_alive.pdfIn PDF document text
    • http://fofafowazu.66ghz.com/what_is_factor_proportion_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_60246b0281de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416656/normal_6001f55bc619a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378606/normal_5ff79dbf68545.pdfIn PDF document text
    • http://xifelaseb.22web.org/86727884495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5fced2755f047.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
    • http://liwubujuwu.epizy.com/guideless_fishing_rod.pdfIn PDF document text
    • http://masifegudogona.rf.gd/63896180697.pdfIn PDF document text
    • http://vofabij.epizy.com/nodiwuditoloselavesuxaro.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/16211538892.pdfIn PDF document text
    • http://rerorupi.rf.gd/58516728486.pdfIn PDF document text
    • http://guligakifiw.epizy.com/bidewidezeveb.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/94104716768.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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 5420 bytes
SHA-256: 6091bf14787177fecdb5bd19f4fd6779a9c4fd03285ff8ef8cb6a1febe8cfb71
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 11384 bytes
SHA-256: 266d6fcd88640731d5eef9b3a7af67db6480659edc84c115625ef464c4588bdb
font_02_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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