Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5922cf1ff041cbb…

MALICIOUS

PDF

83.7 KB Created: 2021-04-05 14:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2e83c3f5441db7de0256e5fbbe319f01 SHA-1: c3f414e4e46ba9873f03a38a85047954adeaa098 SHA-256: a5922cf1ff041cbb6bff8587c4b26bcb729dad081d677160ffd5e78ebf105b35
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Google adwords search exam questions and answers'. The presence of numerous external URIs and its classification as a link farm on disposable hosting indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xezojetit.ru/123?utm_term=google+adwords+search+exam+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fcef57b38b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_602daf4dc84d9.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/cjjQhbo/92776972849.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/db2c0f1083cde7.pdfIn PDF document text
    • https://cdn.sqhk.co/kojanakif/i5gthcD/18412589972.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/tejuzakarodes.pdfIn PDF document text
    • http://zanartcc.net/gerizepajisareb3bg62.pdfIn PDF document text
    • http://ecoterritory.store/10982728939mqq6c.pdfIn PDF document text
    • http://it50off.info/picture_of_boo_radley_housekzrfp.pdfIn PDF document text
    • http://axacheat4.xyz/60095372978u7bpn.pdfIn PDF document text
    • https://wuxavuzipirugud.weebly.com/uploads/1/3/4/0/134012349/9ce95d081ce0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fc9b5e8923a1.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/W9GU0rP/castaway_wilson_halloween_costume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_600a2169273cd.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/6823906.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/gilzif6/70430032454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5ff94997cb32d.pdfIn PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/jelegamelujesedi.pdfIn PDF document text
    • http://marelosolato.iblogger.org/pigesetop.pdfIn PDF document text
    • http://pocki.top/how_long_does_it_take_a_butterball_turkey_fryer_to_heat_upql6cr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_c65d493f474f469887fb2b80420c7431.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_7572563c7cc94e5185c92e44d046a2bd.pdf?index=trueIn PDF document text
    • http://zisibife.epizy.com/how_to_read_electrical_blueprints.pdfIn PDF document text
    • http://sevajujumobilo.epizy.com/jopokixomoruti.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_0dd2707265964b258cd8b5e59ec63622.pdf?index=trueIn PDF document text
    • http://begupegag.epizy.com/centreport_wellington_container_tracking.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_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 5672 bytes
SHA-256: 5581dd210eb2691c36036c2853df4172dba9af3e16a0cd9e3a4a1ca1a6fc3b84
font_01_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 11268 bytes
SHA-256: f022c1efdf4b3029d9c9058b2f8cbb0e3a87ef86a78d741b16cf2ae9a319de8c