Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4695faaa1b458e…

MALICIOUS

PDF

79.3 KB Created: 2021-04-23 11:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6dff8eb6e6af60f6a5229a73e1fff55 SHA-1: cfe4be666e65113025068ab4f67bda8579791482 SHA-256: cd4695faaa1b458e1aa6b51669a8d2940ba38378638a457c66c0a9205f2e58c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF hosting sites, a common tactic for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL `https://gimoguvi.ru/strik?utm_term=present+perfect+continuous+tense+exercises+pdf` is likely a lure to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=present+perfect+continuous+tense+exercises+pdf
    • http://itdiscount.info/berizoxijejedowukzz7jz.pdf
    • http://fruktovik.com/fumutifigj9uv1.pdf
    • https://cdn.sqhk.co/kibutonap/igXjdgh/44340669582.pdf
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdf
    • https://cdn.sqhk.co/doporaba/zgiOgcU/98282029726.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xezujuxoz/c._a._s._e_animatronics_mod_apk.pdf
    • https://s3.amazonaws.com/rimepusox/boden_denim_fit_guide.pdf
    • https://s3.amazonaws.com/wazagidonux/define_platform_as_a_service.pdf
    • https://s3.amazonaws.com/xezujuxoz/ascaris_lumbricoides_treatment.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_099019e0d89f4a8b8c4a79ef007ae90f.pdf?index=true
    • https://s3.amazonaws.com/paropabaru/how_to_build_a_home_theater_sound_system.pdf
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_1553679b2a12467498cecc3463c8f64c.pdf?index=true
    • https://s3.amazonaws.com/daselex/64079297828.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/32323210653.pdf
    • https://s3.amazonaws.com/kovibu/little_red_riding_hood_story_map_pie_corbett.pdf
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_ea3c7cc2c9a245e0bea997b1d84affc8.pdf?index=true
    • https://s3.amazonaws.com/gavobawum/samsung_air_conditioner_error_codes_e4.pdf
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_beea0854f314430c95a1c9d66c93110a.pdf?index=true
    • https://s3.amazonaws.com/bewibiwat/zamokax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec35.bin
3d1ae23ca578dbb2654a64aace5fab00d7c2ea1d5df5153b0f54aaa47e924124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 4860 bytes
font_01_sfnt_off0000fcc4.bin
ae5cc6281eba8390fd7b0ccfd0541c18518c7bc036d2e4842963f987d94c1dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 10752 bytes
font_02_sfnt_off0001214e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 4324 bytes

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