Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea3e8d260b62372…

MALICIOUS

PDF

91.0 KB Created: 2021-04-25 12:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cfc11a6903e2b9e4c2e87cf5ebdb37d SHA-1: 905f8daa2b72ed75cb99221f2ed26c0d60966667 SHA-256: fea3e8d260b62372c739f5d2715dc97b333d7e5a9e2605f17830d0aab519d8c9
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 are structured as SEO-optimized URLs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were directly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=skyrim+immersive+creatures+special+edition+download
    • https://cdn.sqhk.co/supekolev/idxsqie/best_pull_the_pin_games_ios.pdf
    • https://cdn.sqhk.co/bibolaned/het3agz/65524943384.pdf
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/8063598.pdf
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/jubumud.pdf
    • http://mitoxewu.22web.org/solidworks_2020_tutorial_for_beginners.pdf
    • https://cdn.sqhk.co/guwuweri/hiBifpm/18744001178.pdf
    • https://cdn.sqhk.co/walekikem/2jihg9a/61837298391.pdf
    • https://nafuvazufu.weebly.com/uploads/1/3/1/4/131407552/28a514d49d1.pdf
    • https://cdn.sqhk.co/jasuxerazifo/YifhbXo/18662345923.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/933f9ce9-090b-4492-9e02-53b5d91e954a/washington_state_lottery_app.pdf
    • http://sesoxevanadike.epizy.com/56252254497.pdf
    • https://uploads.strikinglycdn.com/files/89ed14ff-f214-491f-a895-d85490eefdbd/coleman_evcon_furnace_parts.pdf
    • https://uploads.strikinglycdn.com/files/2bf28255-09f8-4972-93d9-b51ee09e5ae7/overnight_jobs_near_me_hiring_now.pdf
    • https://uploads.strikinglycdn.com/files/6c5d62cb-5a9b-4f97-b67f-b691d5193a22/25093226604.pdf
    • https://uploads.strikinglycdn.com/files/41a043a7-2c0c-4b4d-8deb-b030bdd2ac9c/vejokumomaza.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_dddcc7b1626e42ca85bc874386e365a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fce7bc59-1a0d-4f8b-ba9b-9ba0d69e212a/tusodutolebab.pdf
    • https://uploads.strikinglycdn.com/files/c6fe2ed4-c60f-4d4b-afa8-04e22a4a89d4/scotts_speedy_green_3000_broadcast_spreader_settings.pdf
    • https://uploads.strikinglycdn.com/files/5394e32e-f7e7-4d7f-b2aa-116d54c7d90b/13838639432.pdf
    • https://uploads.strikinglycdn.com/files/e7425971-e17f-4298-9a80-7d59ce43e2fe/41554004652.pdf
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_a07e26534532438f9eb5e27d92523f23.pdf?index=true
    • http://xojazexodiwosi.epizy.com/suwiwajoredigu.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_7698e279cd364d428034c5fd22385406.pdf?index=true
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_69277ec9b5ee4ed58597e96f593d5724.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010216.bin
f6d27ce305ada332475fdc06c406280c3d8df090b7d18bd8c3e438b5c3c8b273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 5640 bytes
font_01_sfnt_off00011555.bin
dcf3d8a4fcb80d3abf65eb5189bf9542a67436e110143b713ab3bac7f74f2cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 16040 bytes
font_02_sfnt_off000146b7.bin
f12bcc42cb143e9cc41a08ef9f9c81c8a36c017982c073a20263204097028d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146B7 16100 bytes

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