Malicious PDF — malware analysis report

Static analysis result for SHA-256 980c415eb99315e5…

MALICIOUS

PDF

86.0 KB Created: 2021-04-28 20:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9194a45ee52875702d2f028485cb7293 SHA-1: bcb9ac0834e7c0add791ed251352f44621e604f1 SHA-256: 980c415eb99315e500cb11715f42ce04cf1de286535c78dba6ed58eaa2816da2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document body, though partially corrupted, contains a question about grill igniters, which is likely a pretext to direct users to the malicious URL. The presence of embedded external links suggests an attempt to distribute spam or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=why+is+my+grill+igniter+not+working
    • http://munasimowijuxi.getenjoyment.net/35196629445.pdf
    • https://cdn-cms.f-static.net/uploads/4394066/normal_606e2aaf377f9.pdf
    • https://cdn-cms.f-static.net/uploads/4457843/normal_605df487b7b9c.pdf
    • https://cdn-cms.f-static.net/uploads/4366339/normal_600d79da169db.pdf
    • http://pivojowemetobiv.mywebcommunity.org/94753037326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9961000c-bfff-4585-a8c2-7b55e06712e6/21351579146.pdf
    • https://uploads.strikinglycdn.com/files/76736900-3fdd-4e3c-881f-32a58cc3180e/sufurubev.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_f1dfa8562aca48a48fa00f2a17b876bc.pdf?index=true
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_e633ed651acc4889a4b950504aa0c481.pdf?index=true
    • https://s3.amazonaws.com/wifiduxezo/uc_browser_4_java_phone.pdf
    • https://uploads.strikinglycdn.com/files/99f5ec0f-3e96-46c6-811e-fed630b70fc2/pasazuxelas.pdf
    • https://uploads.strikinglycdn.com/files/ca0b89e5-523b-406e-890b-9fd21cca5e77/nubivire.pdf
    • https://s3.amazonaws.com/lofese/aufgaben_performance_marketing_manager.pdf
    • https://uploads.strikinglycdn.com/files/a2cabe05-3dca-46af-8698-97228e107231/honda_mower_parts_hrr216k9vkaa.pdf
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_26bd763998d14153a9a195581b41279f.pdf?index=true
    • https://s3.amazonaws.com/xonaxevetaf/ark_survival_evolved_aberration_map.pdf
    • https://uploads.strikinglycdn.com/files/8e91e330-a1b9-4ce0-9940-ee827f7aa87d/what_word_best_describes_the_tone_of_the_poem_above.pdf
    • https://uploads.strikinglycdn.com/files/12dff8a9-c964-466a-826b-09c845d7686d/what_is_being_in_charge_of_a_vehicle.pdf
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_e3a7c2d622d444fca5cd2a3df4006c73.pdf?index=true
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_1209492f4e2a40b3abd0ad0bf4204bb5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d8eefb7-2dc8-4b56-a822-c94981c0ea24/roots_and_branches_5_element_qigong.pdf
    • https://s3.amazonaws.com/buxoparadazegu/41150987094.pdf
    • https://uploads.strikinglycdn.com/files/a3a054b2-02c1-4d96-8c56-de67e131bff4/15800922753.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_off00011038.bin
1e08d127267310debf9fdef70607a05005b2c4f3b800a2fad6a9614446dd6798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 5160 bytes
font_01_sfnt_off000121bc.bin
74b5e57d3c42590db75118b82b523652cebf995885e8916f91efcefb78e25d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 12020 bytes

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