Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b1a800304b9d3e…

MALICIOUS

PDF

78.6 KB Created: 2021-05-20 03:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d45194cc1b6e75dd26e58f761a97e49 SHA-1: 9d08ab86f6f3386d49af9af7603d7c937efe4b45 SHA-256: 56b1a800304b9d3e3a78a160d7f87101c436135df4d48d3e69c17f1f0090e53c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous external links, including one to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to using a drip coffee maker, masking the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jacksth.ru/strik?utm_term=how+to+use+a+drip+coffee+maker
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fdd41dae478c.pdf
    • https://xikodixugab.weebly.com/uploads/1/3/4/7/134707070/66b6e0ac0a51.pdf
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/zawos.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_602ffabbb883c.pdf
    • https://cdn-cms.f-static.net/uploads/4402261/normal_60567138e9c12.pdf
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/pogefenav.pdf
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/josalix.pdf
    • https://cdn-cms.f-static.net/uploads/4387928/normal_601982fa4048a.pdf
    • https://pabojigu.weebly.com/uploads/1/3/4/8/134862721/aedbaebf4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1e232dd7-4e6e-4190-92ba-a9ed9332b3a0/tom_clancys_rainbow_six_siege_gameplay_trailer.pdf
    • https://uploads.strikinglycdn.com/files/b0ad8e1a-4bb2-41cf-9fbc-1df1d1c641b7/pofuxarelazakagiberudob.pdf
    • https://s3.amazonaws.com/xesigeze/wixexotuvuriwiwanom.pdf
    • https://s3.amazonaws.com/papuja/your_name_facts_app.pdf
    • https://s3.amazonaws.com/vinejivunitego/durigonifemo.pdf
    • https://s3.amazonaws.com/vabedafozo/diabetes_treatment_guidelines_australia.pdf
    • https://s3.amazonaws.com/wulagisi/the_sparrow_book_plot.pdf
    • https://uploads.strikinglycdn.com/files/50121aa2-5de4-4099-891d-7920d7420320/39046709130.pdf
    • https://uploads.strikinglycdn.com/files/8559b7c5-b3fc-44aa-b5b0-cb970e12f788/asus_maximus_viii_hero_z170_specs.pdf
    • https://s3.amazonaws.com/vonusirukete/69549425613.pdf
    • https://s3.amazonaws.com/roxawo/2_cycle_engine_oil_msds_sheet.pdf
    • https://s3.amazonaws.com/xufujofaleki/wegakikob.pdf
    • https://s3.amazonaws.com/wewiro/how_to_repair_hot_water_dispenser.pdf
    • https://s3.amazonaws.com/debamijizozexo/72719497178.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_off0000f557.bin
45cbc9839254c67a1ee3fd483edcf0360b7169e886ab656e164e065144ba34bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5388 bytes
font_01_sfnt_off000107a5.bin
eb538b8fc54be5da2449315c0be26e644a4780100f5b91988bd38701abfec44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 11016 bytes

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