Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e64f0451e9eed19…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 14:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05959958e8e4c4b67f64f3abb699c24e SHA-1: 4f0eadb3a7b2d39d8585fe8e856edc6c87f3c982 SHA-256: 6e64f0451e9eed190e12f1b3aa9ebd15f328de23e914860909b0a29bec2a7c6d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO spamming operation. The primary URL, 'https://baarspo.ru/award?keyword=ancient+history+book+for+upsc+pdf', suggests a lure related to academic resources. ClamAV detected this file as 'Pdf.Phishing.Trojan', and a machine learning classifier assigned a high probability of maliciousness. No scripts were extracted, but the overall structure and URL patterns suggest an attempt to redirect users to malicious content.

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://baarspo.ru/award?keyword=ancient+history+book+for+upsc+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499636/normal_601915d1df5e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_601b3612b6e6c.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/8633834.pdfIn PDF document text
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/755497.pdfIn PDF document text
    • http://kupelobivinix.22web.org/xarosif.pdfIn PDF document text
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/mawovuwepobulilob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_602f0910ac62a.pdfIn PDF document text
    • https://filinisosiwox.weebly.com/uploads/1/3/0/8/130814007/botuzipifux.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/1260731162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_604b9fe6b339e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_a30339a4f0464457b370916c3fcec18c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/gabriel_s_oboe_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/35420924482.pdfIn PDF document text
    • http://telimagafire.epizy.com/saserufazedavine.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_e2c7d145dcf140d99ec8ae2f4e3d0c84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/79138619448.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/honda_inverter_generator_eu2200i_for_sale.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5296 bytes
SHA-256: c3973d8db103d8fb1eb762d841486ae346fab6701a9005a8ce3eca02d28bc12f
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10596 bytes
SHA-256: 3715eb3d19b82c2beb733734965566869b47de276660ca73626ede65f3aeefa8

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