Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a20c8280cbd2ef…

MALICIOUS

PDF

76.5 KB Created: 2021-06-08 16:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d7c158439116927a60b0c5349c5bb0bb SHA-1: 6bff3a3e446dbe9471fb160ae7ff0ade93d4f1a3 SHA-256: 89a20c8280cbd2ef4ab661ef8c7f7e6970eea8a9d6e215f62a9b6343dc7d4718
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of a malicious ML classification and ClamAV detection indicates a high likelihood of malicious intent, possibly related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/123?utm_term=beautiful+couple+image++hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419851/normal_60159bea7cff5.pdfIn PDF document text
    • https://josusijino.weebly.com/uploads/1/3/0/7/130739082/4347dba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_5fd246044158a.pdfIn PDF document text
    • https://siganubamisibu.weebly.com/uploads/1/3/4/1/134108806/2392480.pdfIn PDF document text
    • https://mevexifuk.weebly.com/uploads/1/3/5/3/135345040/93808e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_602f52ce26e8f.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/timirasopeliz_jivilini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejuziz.pbworks.com/f/fixegozibug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/041859a1-bdd8-477d-bc7e-12bf103b0803/how_do_i_know_what_model_my_remington_700_is.pdfIn PDF document text
    • http://zipiwume.pbworks.com/w/file/fetch/144735240/kositem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0ccefc-cc84-4f2a-99d8-e130964306d3/dell_latitude_e6410_laptop_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f82dc2-3ab2-49a5-8258-4615c3b615d7/what_animal_makes_buffalo_wings.pdfIn PDF document text
    • http://wikifuvuz.pbworks.com/f/what_is_the_age_limit_for_national_youth_service_corps.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/39714652017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f21920-5611-4567-a724-a49dc36da10b/87460422853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c69fdeb-979f-449a-8ddc-4f9393c57568/66834973586.pdfIn PDF document text
    • http://gapufipi.pbworks.com/w/file/fetch/144548574/macbeth_act_5_scene_1_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802652e1-f5a0-4cde-a422-6724eb101d41/prometheus_unbound_summary_shmoop.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/survival_on_raft_crafting_in_the_ocean_mod_apk_android_1.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144428529/hack-cheats_war_and_order.pdfIn PDF document text
    • http://wigonewakil.pbworks.com/f/doki_doki_literature_club_yuri_fanart.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 5344 bytes
SHA-256: 2dbef94e8b06a82d0929fcae2e64da9d8b438bb1dcfec0ae4a28eba269970edc
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10852 bytes
SHA-256: 7cc4b69eaa100fb0ee328ff38ef4c44771dbf732010aaa4947733ee544e1c882
font_02_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 16252 bytes
SHA-256: 87f03834eefa06c1c0882ec100151dba814b2026c2d0943f8ee0304b282605a7