Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ac9a7bfc22f3d4…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 02:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86977776cbe39f9531835954498e0f64 SHA-1: 759e49fb037d2c09a38b99a12e861b588df5de9d SHA-256: 37ac9a7bfc22f3d4459deee9382d15d4417674ddcbeb0460ee72577116ea529d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('golowaki.ru') that is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of using disposable hosting for malicious links. No scripts were extracted, but the presence of external URIs and the overall detection suggest the PDF is designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=elements+of+musical+play%252Ftheatre
    • https://cdn-cms.f-static.net/uploads/4404725/normal_60237fb98fa9d.pdf
    • https://vikuxujawud.weebly.com/uploads/1/3/4/5/134515409/fuxinutov.pdf
    • https://static.s123-cdn-static.com/uploads/4529893/normal_5fe17c425ae2d.pdf
    • https://mekujukoner.weebly.com/uploads/1/3/4/7/134715553/f599f7bea48.pdf
    • http://bifilazona.22web.org/liloborolok.pdf
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/7472842.pdf
    • http://stixlife.info/867072216416c6do.pdf
    • http://gapilojazixo.getenjoyment.net/11976619291.pdf
    • https://vakuvovigoder.weebly.com/uploads/1/3/4/4/134467198/vedojikewazofemi.pdf
    • http://legumajati.22web.org/effective_public_relations_11th_edition_citation.pdf
    • http://suxulopiluv.22web.org/printable_fairy_coloring_sheets.pdf
    • http://gonalotuturopil.mywebcommunity.org/vezatajuguvu.pdf
    • http://vopugixeroramox.medianewsonline.com/ryujin_3.5_for_sale.pdf
    • http://ejqy.com/convertidor_de_frecuencia_a_voltaje_lm3315ea0j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://madepadejatutof.onlinewebshop.net/oxford_phonics_world_level_2_teacher_s_book.pdf
    • http://kowivinig.epizy.com/icici_bank_full_information.pdf
    • http://zunuwovadete.epizy.com/tolirusutokoke.pdf
    • http://mejusamenubeto.rf.gd/98503321993.pdf
    • http://javewexo.epizy.com/free_android_games_with_best_graphics.pdf
    • http://puxalalofevan.rf.gd/dobinurikoliwigodeko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f255.bin
e2310d7b3b6fb92a080de5c77f0c714c884dde87946437dd4d663734a1e1e0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 5348 bytes
font_01_sfnt_off00010475.bin
a4f36ee11aad71ed6fc721dcba2599b93e2ca6fd5fe98b943c4c26c602b94ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 10776 bytes

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