Malicious PDF — malware analysis report

Static analysis result for SHA-256 170bca09dfd27258…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 04:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06cc5a549f335301abc8933d674fb96d SHA-1: 7dbfc2b52f3f4022196ddbbe40f2bbd93c8b9119 SHA-256: 170bca09dfd27258309d4f237e2f3eb1c95d35a33530cd59793e7fc86a9e75f4
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as a malicious advance-fee scam lure. It contains numerous external URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true malicious intent. The document body, though heavily obfuscated, contains keywords related to renewing wedding vows, which is likely a pretext for the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/wix?keyword=renewing+your+wedding+vows+after+an+infidelity
    • http://worabipupe.mypressonline.com/your_health_today_6th_edition_free.pdf
    • http://golixudib.mypressonline.com/samsung_front_load_washing_machine_error_code_e3.pdf
    • http://sozawakofuriwoj.getenjoyment.net/dawezexo.pdf
    • http://kidupat.getenjoyment.net/29772545108.pdf
    • http://jepegupunu.mygamesonline.org/81790907743.pdf
    • https://cdn.sqhk.co/jimevexir/kQhchfB/mibepufenananuwali.pdf
    • http://busijizi.medianewsonline.com/10135476149.pdf
    • https://cdn.sqhk.co/navimoxa/iiWighb/townsmen_strategy_guide_android.pdf
    • http://lenudes.com/nexuzezomosajulubupagekole8l9.pdf
    • http://vannabanyavsedela.xyz/fiturigat4lsgo.pdf
    • http://ag-management.space/laborp3dlz.pdf
    • http://xuvavarapegu.mywebcommunity.org/mage_awakening_2nd_edition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vafitinupisojud.onlinewebshop.net/legal_aspects_of_healthcare_administration_13th_edition_free.pdf
    • http://woranuganavot.myartsonline.com/simpson_ms61043_pressure_washer_reviews_2018.pdf
    • https://s3.amazonaws.com/penefelomiju/bumeroveruduridetolin.pdf
    • https://s3.amazonaws.com/sazomo/61501725362.pdf
    • http://dolojivek.onlinewebshop.net/18337856202.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_off0000f4fc.bin
847eef388582116f74ba1d1027459fe78043521a36318cb1d45e552f823d1be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 5336 bytes
font_01_sfnt_off00010755.bin
2eb3453b860d108b16ad06d3bc70e20a7ac8a4137d075c9474e3bb21d8ad5836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 10612 bytes

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