Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cb63c8f439b03d…

MALICIOUS

PDF

82.0 KB Created: 2021-03-31 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bc3ff81d8e530ff4b679607c9eef9050 SHA-1: 5447628c89df031360f023b61b56efef8143298b SHA-256: 97cb63c8f439b03dec9b043b993a54a3af57f6829de79a4084c33e906ac90120
174 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a lure for fake invoices or payments. It embeds multiple URLs, several of which are algorithmically generated and hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/award?keyword=asset+turnover+ratio+analysis+pdf PDF link annotation
    • http://hrushch.space/mevatasasagopibewub74cd.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/c040d.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/2021023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_605d424e6d0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_605b055f41159.pdfIn PDF document text
    • http://vigastlens.xyz/cosco_scenera_next_forward_facinghe27s.pdfIn PDF document text
    • http://francobusiness.com/muvelumewulofoxisusunilimwjixq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_6006905aba809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_6025004f83919.pdfIn PDF document text
    • http://storeeu.info/davax83a9m.pdfIn PDF document text
    • http://afracheat7.xyz/69813960770z5t51.pdfIn PDF document text
    • http://complect-tech.ru/dexofamid3oj7k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_601dbd3138510.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/d46b9701a2.pdfIn PDF document text
    • http://niwopofe.scienceontheweb.net/lajitunofez.pdfIn PDF document text
    • http://bio-ita.fun/weber_grill_rotisserie_replacement_partsnoynv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3022b562-2d04-4ba3-93ed-842bb82371bb/commercial_electric_digital_multimeter_review.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/barupiredatamemosewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b53f5a-9f26-4146-98ad-5aee3f30de5b/navy_subspecialty_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57cc625-9fff-462e-9dd4-b30743142667/what_setting_should_my_cpap_humidifier_be_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50b3016-cf16-456e-af1f-76a28d13dee2/lukibowujatenugoso.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_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 5184 bytes
SHA-256: ea5480aadb720be624df367ccdf4034a996d38991554db44cecbcebbcd192fec
font_01_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 11840 bytes
SHA-256: 4ca39ce51de4e929a01af61f6f6cb5d2d18dd0dffedac231fe69ff111ff490bc