Malicious PDF — malware analysis report

Static analysis result for SHA-256 c830cae721fbf872…

MALICIOUS

PDF

73.5 KB Created: 2021-02-25 17:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 007de0f9c8dc08478c87fa98e6b03239 SHA-1: 4c59a9f11b44e46fc4faff3642147c7fa1206167 SHA-256: c830cae721fbf8729ac5b3e124f229c026bfd7329054878a4ab4de436441a4af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with a specific detection of 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=flow+diagram+symbol+definition PDF link annotation
    • https://cdn.sqhk.co/dekavaka/iimhfjx/my_mini_golf_scorecard.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/jffSDif/86094028693.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/vmcjj1E/30945815457.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/intellifax_2840_not_receiving_faxes.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/MJhejjo/driving_police_car_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/j0iDpjd/rapetegifon.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/0efaf97f3.pdfIn PDF document text
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/beroku_datoxewisajajum_rofake_ridaradujemuven.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/7hdggxP/fire_ice_air_hockey_table.pdfIn PDF document text
    • https://cdn.sqhk.co/ledirevobep/jjge6hc/bovuzuxigomidotubin.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/5c1f1be18417b.pdfIn PDF document text
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/begelubuxapex_romokofupeb.pdfIn PDF document text
    • https://cdn.sqhk.co/lukupupiba/WhaZhcs/xmeye_dvr_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeborawaleko.atwebpages.com/how_to_find_a_percentile_rank_from_a_z_score.pdfIn PDF document text
    • http://ridabus.epizy.com/fovonanoredenumox.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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 5516 bytes
SHA-256: 784531331e9127e4a7425ca9b5d23c47a0b467c4e3fa3ddf13eb7b9543742548
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10976 bytes
SHA-256: f9c0388e0e678a5eef16c39f6c75a43309f9798e550c7d47096a3eaa6e79b246

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