Malicious PDF — malware analysis report

Static analysis result for SHA-256 8224abe14c396306…

MALICIOUS

PDF

69.9 KB Created: 2021-03-16 05:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37993f0be6e744651590bb6d8ae8e645 SHA-1: 515e5b9497d6638573be9ec697d61afcd58808f7 SHA-256: 8224abe14c3963068a99463298c5e9dd2679d549eda5a965b0ab3f251b09e6a1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being resalured.ru. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, suggesting a coordinated effort to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://resalured.ru/123?utm_term=days+of+the+week+worksheet+kindergarten+pdf
    • https://verikadofaja.weebly.com/uploads/1/3/2/3/132303102/nawesedefoxer.pdf
    • https://risimomumet.weebly.com/uploads/1/3/0/8/130814588/2935706.pdf
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/1435380.pdf
    • http://doordash.link/weruwudezonojudavekapefumoht6.pdf
    • http://tvoyoproc.fun/the_wounded_healer_booktsxwb.pdf
    • http://copyright-securityx.com/namodezuruluviroriz79yr.pdf
    • https://nakotibuvifotog.weebly.com/uploads/1/3/4/6/134619478/9369655.pdf
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/sorivi.pdf
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/vovajitekililakar.pdf
    • https://safapovajedetux.weebly.com/uploads/1/3/4/6/134642125/rafipoveto-geloripogudavet-wufuninifulagul-watefesuborudub.pdf
    • http://ruszaimclub.ru/bissell_spot_clean_proheat_pet_leaking_water_from_bottomtb7rb.pdf
    • http://trokot-shopnew.online/kisuvasafeduz5gwz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_6c44359c980c4beab5d688cce9a92b77.pdf?index=true
    • https://uploads.strikinglycdn.com/files/203a0d5d-8bdb-4591-9af4-795c4a2e9d3f/nato_phonetic_alphabet_examples.pdf
    • https://uploads.strikinglycdn.com/files/76206149-fb86-4959-9926-3313fd8f01f2/biblia_de_jerusalen_gratis_descargar.pdf
    • https://uploads.strikinglycdn.com/files/bf66dbda-c029-4705-9d0e-261efb8287c5/who_is_the_creepy_man_in_geralds_game.pdf
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_baa93fa9c06c411984cb392f215214e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55b9211a-731e-482a-aeb2-667ce520dead/ddp_yoga_bad_reviews.pdf
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_1d1ca2e43f124704b73eff445dc070b7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d257.bin
8d83fbbd1c9ff82b571ee68ce3050e0a40357ff69ea25d196c9da4d990b4e66c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 5528 bytes
font_01_sfnt_off0000e543.bin
c53dcc73a46f3579178cbf4215c38918f37f7a72ce5965de0a6c78011b9d4daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10144 bytes

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