Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9971fbf1b169b9…

MALICIOUS

PDF

72.9 KB Created: 2021-04-03 23:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4a90d35b750424229bc3fa741b7746da SHA-1: 406124b01687d565c0a1183f118bbf20f982a419 SHA-256: df9971fbf1b169b9275f2d8fde5a0c91a5d2689e42ae771ffa8dc021639d9054
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

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://jumiwimov.ru/wix?keyword=algebra+1+study+guide+for+final+exam PDF link annotation
    • https://lolemifazez.weebly.com/uploads/1/3/1/8/131871650/4585570.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/pesesose.pdfIn PDF document text
    • http://barivelovone.22web.org/26005328894.pdfIn PDF document text
    • http://jadivaza.iblogger.org/rocklers_complete_dovetail_jig_with_dovetail_jig_dust_collector_combo.pdfIn PDF document text
    • http://nurinubofed.iblogger.org/87769819022.pdfIn PDF document text
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/demisomijub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_602c373b4b291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6019592e0af56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5fd907a3d0706.pdfIn PDF document text
    • http://xovonakajo.22web.org/circular_economy_report.pdfIn PDF document text
    • http://putifid.iblogger.org/zaludovipiwomobemule.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/femesakokixezewol.pdfIn PDF document text
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/xovutilifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wozoxub/sasural_genda_phool_serial_song_free.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_5a39fd58b6e4432c91b4ece711df487b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/irobot_roomba_960_price_in_india.pdfIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_7685f0943a6a4b449761912abaad5467.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_cb82ac7bc3e04d88b42c857ef60e8dbe.pdf?index=trueIn 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_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 5580 bytes
SHA-256: 59a9bee3a756c1a023f22a003bf962861d467674ea4c9ac61a9fbfe605fedc8c
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 10372 bytes
SHA-256: 41d4e456afdd2adac37e9c2b6507bc00d30e00b2984da60283becaacb938f690

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