Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7008a2830b0d32…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 08:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 86b9387aa4c5241f4c98c947b3fd8313 SHA-1: 9abd3a438311a9babccc6ed557f8c240e609387b SHA-256: 2d7008a2830b0d32584af7f84a0f740b8d296f2cce184deb339e1665665d368d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'default associations configuration file pdf', likely intended to trick users into clicking the malicious link.

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 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://pelibifir.ru/award?keyword=default+associations+configuration+file+pdf PDF link annotation
    • https://cdn.sqhk.co/zejejofe/igjwjcX/14th_finance_commission_report_in_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_600a738be7d0f.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/icNK9jj/xerinenajigapuxeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60177980e13e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_fd1f803e62b541f5a9c1f5ee1b54497f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sivanira/70972727554.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/beta_house_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/causation_of_crime.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_d9e6da75c7124cb990412a3dd711a370.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/44401334898.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/sears_kenmore_elite_french_door_refrigerator_complaints.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/42170752288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb55110-c8bc-4b86-ba4d-35a5ebe933d1/how_to_fill_out_aflac_dental_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/babylon_english_to_persian_dictionary_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f349f2-4e88-4a71-94cb-8979286f2e9e/why_is_my_router_not_connecting_to_the_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/free_asal_kau_bahagia_armada_band.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5204 bytes
SHA-256: da2bc6bec9164b20667bd0dfd1ce6bc9a0571d8c3255978f73d0e135d0e1bfad
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 11104 bytes
SHA-256: f90bb95b5cfac3bf5a288e2e06c1b674884073e2af25e1c0a9958143216550d3
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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