Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dae06a5cf614e4…

MALICIOUS

PDF

77.2 KB Created: 2021-04-05 17:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 10dfc04773c31063ed1de4e40af0d6a1 SHA-1: de7e0b8d2377a2daa9c425748cb3cc9aac991bab SHA-256: 91dae06a5cf614e48d834986e86aa7b29ebe3ae7295d39784bb17e4ce8822927
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/123?utm_term=cinema+paradiso+josh+groban+sheet+music PDF link annotation
    • http://fotubobuwenapu.scienceontheweb.net/nenoxe.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/baborenomugurugedi.pdfIn PDF document text
    • http://kunewalijaxuna.getenjoyment.net/verification_of_assets_and_liabilities_in_auditing.pdfIn PDF document text
    • http://figosagimetiki.iblogger.org/cfa_program_curriculum_2020_level_i.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/blackstone_real_estate_debt_strategies.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/80348288085.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/18261484603.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/tizazigaweriga.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
    • http://lekaleramitogal.rf.gd/bobug.pdfIn PDF document text
    • http://mufigodukusa.epizy.com/microsoft_wireless_keyboard_2000_lost_usb.pdfIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_ef2d395a381341af8c961797ddee3fde.pdf?index=trueIn PDF document text
    • http://lalesokam.epizy.com/math_worksheets_for_kindergarten_numbers_1-20.pdfIn PDF document text
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_161f2e40cb0f40fd91ab90a118c74130.pdf?index=trueIn PDF document text
    • http://zuronixo.rf.gd/warcraft_3_remastered_release_date.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_a90aadb737e247b584c36f3cdf4f3378.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_6c5b4f98c659409c96cca26548c06d6e.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_d93c804588834cf3852f82c7392df3f2.pdf?index=trueIn PDF document text
    • http://kisepupiregeseb.rf.gd/jigsaw_movie_2017_parents_guide.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_d5a8498bfabd4cdd8d0aca811cd4f082.pdf?index=trueIn PDF document text
    • http://samupuvigerolo.rf.gd/chlorosulfonic_acid_safety_data_sheet.pdfIn PDF document text
    • http://pixipisifoxuj.rf.gd/pajavotugumut.pdfIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_da25360809564d10b578a2a4746c6c8f.pdf?index=trueIn 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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 5576 bytes
SHA-256: 0fa2dfa14f0323c1e29b41c2dcd4782e27598ae67741eadd4591e1b91c464a14
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 11064 bytes
SHA-256: 6485cb4a7f83575fab812960dae0cbe314f28451c003ee980bacb9d532d5ad09
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176