Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11d524ef8cc0331…

MALICIOUS

PDF

84.9 KB Created: 2021-04-03 01:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12b3942a22ba9973ebc583d39c49d066 SHA-1: d5597525f49b8c093ce369ac798017bea0735799 SHA-256: f11d524ef8cc0331d5c2e995e033410a4f7a6ba7b4fa92db0bee8696735c8bbb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic identifying it as a PDF link farm. One of the primary URLs, 'https://jumiwimov.ru/strik?utm_term=nyc+subway+lines+brooklyn', suggests a potential phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution vector.

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 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.
  • 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://jumiwimov.ru/strik?utm_term=nyc+subway+lines+brooklyn PDF link annotation
    • http://kitigaw.22web.org/7608993105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_600cf0233db01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5ffeb8decf4e4.pdfIn PDF document text
    • http://kogudajinisu.iblogger.org/cactaceae_family.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455195/normal_5fcd855dab9c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_5fdb22291dca3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/stressed_out_twenty_one_pilots_lyrics.pdfIn PDF document text
    • http://rebikesumusosu.rf.gd/pekezozulexedukis.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/24107928799.pdfIn PDF document text
    • http://fadevosozegula.epizy.com/harry_potter_book_3_page_count.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/classic_wow_druid_tank_leveling_guide.pdfIn PDF document text
    • http://lurilufe.epizy.com/nubogilinaxexido.pdfIn PDF document text
    • http://fonujepurixadal.epizy.com/62884324284.pdfIn PDF document text
    • http://sekizipax.rf.gd/what_is_shinigami_in_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/arcep_tchad.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_94cc13ff06d449efa07e86677c7d53fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozilum/how_to_draw_eyes_mouth_and_nose.pdfIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_e244f065709640feab25979c3d1ce136.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/danby_dac060eb6wdb_6000_btu_window_air_conditioner.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_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 5160 bytes
SHA-256: a7dd057e7b7bb43c66ee85dde65495607a20930ea9c76749e7bc94830fa5d3ee
font_01_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 11292 bytes
SHA-256: 019749ea639d5254ab2e31945ac4da25857681051c80be7f295561237b2c34be

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