Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2df866624198bf…

MALICIOUS

PDF

89.8 KB Created: 2021-03-20 14:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7fe403e57d826a537f77038797bdd963 SHA-1: 5a2e75f6d6e7a0db8eeaa610913306c5040bf6fb SHA-256: ac2df866624198bf97a606f376f405e13ab9bbd3faa9c6a9df54a1f13eca177f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=carol+of+the+bells+piano+music+sheet+pdf PDF link annotation
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/5896195.pdfIn PDF document text
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/3291773.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/lubeganewisutaf_zipere_nuwepijajulivi.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/e7b5bb4d83893.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/1454040.pdfIn PDF document text
    • https://vinozesuwoda.weebly.com/uploads/1/3/4/6/134685541/wevivejut.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/sanozawawa.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/pafalif_tivudunurizov.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/tulojezupawe-bukufonata-wadikasukawom-julizotirusi.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/zuxanutujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ef6117-4f4f-42ed-8e2c-492daf889f1e/91228895934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa89ff9-e4f6-491e-a05f-20a95d169be7/psalm_23_vs_1_to_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee46dec-07d4-40e4-8055-36793f97f774/hm_digital_marketing_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9e3e4e-daa4-4336-b43d-0f963291a781/how_to_connect_my_universal_remote_to_my_element_tv.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_cf2e9cb97d374ef8b16955ddc2c53300.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c00649-846e-4e02-a8f6-2298e1c5bc1a/what_is_the_importance_of_knowing_the_perspective_of_the_ff_anthropology_sociology_political_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6335bfaf-f3a5-47c4-b788-1111298b2a3e/skilsaw_circular_saw_blade.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_f12f7b536bbf43dfb477ade6ffa163d2.pdf?index=trueIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/ethical_hacking_meaning_in_urdu.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_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 5440 bytes
SHA-256: e618d0411d9cb0574dc5f75f96ebff2450aab96f36a9975d632a43fc0f7cd4fa
font_01_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 11736 bytes
SHA-256: 6768f5375841dc386c11591cecb1adde4c4f9ab47f4569eb5017b0f7539fa369
font_02_sfnt_off000144db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DB 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742