Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a815c9548764dea…

MALICIOUS

PDF

77.6 KB Created: 2021-05-17 04:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 42a1b92ad1a630fe30ac4c33733d3afb SHA-1: 13d84558c05bb37a318f763c9ed5f6459bc74dae SHA-256: 6a815c9548764dea41fda58402a92e81dad20d84777be35955184c7fe1fb8cb9
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. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'vilenefex.ru' and associated with a search term for Samsung dishwasher errors. This suggests a phishing or content-luring tactic to drive traffic to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a network of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=samsung+dishwasher+error+code+blinking+lights PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481291/normal_5ffaa7355073f.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/2310668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_600dd827a7bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_60115821000e1.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/the_constitution_of_liberty_audiobook.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/nixapolaxovevokenavug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365607/normal_5fc660118b26d.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/wogufekoxewabawul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fc6b95a5f6b9.pdfIn PDF document text
    • https://mafoguwof.weebly.com/uploads/1/3/1/4/131438304/susotub_gekagupi.pdfIn PDF document text
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/dogovojupo.pdfIn PDF document text
    • https://gaparomid.weebly.com/uploads/1/3/4/6/134632142/nobobolutukoziren.pdfIn PDF document text
    • http://tunewejewuz.mypressonline.com/how_to_factory_reset_my_netgear_wifi_extender.pdfIn PDF document text
    • https://ruwivogisi.weebly.com/uploads/1/3/4/2/134265822/4cf4130e4e0afb.pdfIn PDF document text
    • http://zizowifajazabor.22web.org/what_do_brown_bear_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likifodafiduno.epizy.com/14754376067.pdfIn PDF document text
    • http://xubibufopude.epizy.com/learning_english_free_worksheets.pdfIn PDF document text
    • http://tokofom.rf.gd/rojovuxutujad.pdfIn PDF document text
    • http://datasixiva.epizy.com/90786110881.pdfIn PDF document text
    • http://pigumomibi.onlinewebshop.net/sociological_imagination_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/samsung_65-inch_q7_4k_ultra_hd_qled_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/924809252.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/form_bootstrap_4_textarea.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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 5752 bytes
SHA-256: 751c109f5306c6228a1f0ecb40cb8e94f39986176851e2ae6b5d9d0092a2c6ff
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10228 bytes
SHA-256: a0ffa0ab56438b4b481bf49cc8d964d4a7221dda129ca4c0ae877cd2dc399022

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