Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7997303474908aa…

MALICIOUS

PDF

78.6 KB Created: 2021-03-12 09:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 865641cdb6cfeb1a0892215e4ce0d9f0 SHA-1: d7b7a76076b816947d3f7490480540f5f3f2053c SHA-256: f7997303474908aa8527262be4900af3aeaaf33ec7574d33a42d1fdb0b7cf117
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 0.9991

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=learn+english+free+classes PDF link annotation
    • https://jasasexu.weebly.com/uploads/1/3/1/1/131163864/kilode.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/zepikerojot.pdfIn PDF document text
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/vosimubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_600c37b634241.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/6568166.pdfIn PDF document text
    • http://pumba-timon.space/jufufebariguwobemaxusodiftkdfq.pdfIn PDF document text
    • https://zigepavozaw.weebly.com/uploads/1/3/4/3/134349437/watododunefuga_zuvogof_zazinidegoxazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_602ac22507c75.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/xiwomikowago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_601ae0fcce2c1.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/9703363.pdfIn PDF document text
    • https://sasepanubur.weebly.com/uploads/1/3/4/6/134600976/nogaxemiruzuluwonozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_601d169d42651.pdfIn PDF document text
    • https://lapedegino.weebly.com/uploads/1/3/4/6/134689006/kevener.pdfIn PDF document text
    • http://oyuncuxx.com/holt_science_spectrum_physical_science_textbookmk7js.pdfIn PDF document text
    • http://ewwe.space/jumezojedibagajit4p5qf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_60364931efe01.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
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_719c1e5d124a4ecbb80a0b9ad09b8be8.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_fc6ecb1b09d7419395766453109e48cd.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_8e4de332fe91407296dbd4cd57e9599d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c0bc14-aae4-456f-9593-19f0a4b17bf9/your_grace_is_enough_matt_maher_guitar_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a62eb5-b8dd-43ed-8db2-96145d4af062/beats_wireless_pairing_unsuccessful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0b639d-0886-40c6-96b7-b3cf2a429f80/nevibulureza.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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 4684 bytes
SHA-256: f0b66352001009e1d21a1af834d1b00cbf8afe1818cd1a35d16fe371f4c55ff8
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10836 bytes
SHA-256: 381e0be911d085a939662e43951499f518c118e7eb4e1b7dedd4bd5b1c0b7775
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3