Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afb27040aa18ea6…

MALICIOUS

PDF

77.5 KB Created: 2021-02-26 10:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b5f7143083c57b88e7052735768ab117 SHA-1: 95695acd91a37c4dcd45d4ace8824954611ffc68 SHA-256: 5afb27040aa18ea6b0178db13f2c7bcd4b040acc45a2e8024ddc5319bab3652a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a product review, consistent with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=irobot+roomba+675+robot+vacuum+review PDF link annotation
    • http://vuvulusigi.scienceontheweb.net/ragekirer.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/1d82f8e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_600ebc61cdde2.pdfIn PDF document text
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/vegenixiran-fuwota.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/sensory_neurons_have_a_resting_potential_based_on_the_efflux_of_potassium_ions.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/what_math_is_used_in_aerospace_engineering.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375702/normal_5ffc69fa0f61c.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/09c08fda4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_6021868a08332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_60349ac148d3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ff51ee3c89ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roparewuna.rf.gd/free_view_tv_guide_perth.pdfIn PDF document text
    • http://pedijuwugeta.rf.gd/afro_pop_beat_free.pdfIn PDF document text
    • http://wigazimo.epizy.com/zugubodesam.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/read_theory_analogies_3_level_8_answers.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/98483129632.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/libro_calculo_integral_bachillerato.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_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 5324 bytes
SHA-256: 17fe5fa48f6b3c61bd26779423d2781493783a09de8d20275b3c710c57ed41d6
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 10564 bytes
SHA-256: ab56aa2422574fa4c5ab8b11ca33a18aa9fc017ba748ec533b0992564e65151d

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