Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45979542e336b73…

MALICIOUS

PDF

76.6 KB Created: 2021-04-06 12:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efa2c103ee2c4f7567987bcae06bb414 SHA-1: ca61a73ac329c323e9cc3b8d3eea9af2660d3874 SHA-256: a45979542e336b734a4f33735990c5bcd652e285346c8d7da305be90653f01e3
186 Risk Score

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://lozipotod.ru/aws?utm_term=uscg+medical+certificate+status PDF link annotation
    • https://cdn.sqhk.co/zunezafi/ib2iajd/vupulozodajaz.pdfIn PDF document text
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/5d426.pdfIn PDF document text
    • https://gotowixupin.weebly.com/uploads/1/3/4/3/134393593/5362187.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/ehmhjee/las_vegas_softball_tournament_january_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/j0jfiix/airthings_corentium_radon_detector_manual.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/60630480387.pdfIn PDF document text
    • https://cdn.sqhk.co/tesadubozino/jc4kcib/harvest_moon_drive_in_gibson_city_illinois.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/crXhica/nazi_invasion_of_poland_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/jedNJsd/ratanujikeloniximidaxu.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/benim_hocam_corafya_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/df6jcLy/setizidarezamuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_abb917786f2f4b9791700d51f7f852f3.pdf?index=trueIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_36d702713d5a4c318cc2eb04024daec9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/40331263457.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_a64f6c39068742ff98cbdeef007e3804.pdf?index=trueIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_10d45d67ee9c4a8c9c76eeeb24f72ef0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/digotudofivepelesivoki.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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 5332 bytes
SHA-256: edec8b32ad3241ad2e99d518f582a9195eb0bb6987ccf8f6a2be1d64dbed9e42
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10656 bytes
SHA-256: e1096ea081ef9d03ee52099a7ff7a3f2314869863295be4b958be5a41fede1f0

Open this report in the interactive analyzer, or submit your own file for analysis.