Malicious PDF — malware analysis report

Static analysis result for SHA-256 d983ef616ecbafd5…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 06:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6717c6cd44ff2c50a80f3443a6973311 SHA-1: ba4b4202b59eef84ebd574b3580e4b3419737888 SHA-256: d983ef616ecbafd5331e26b7ea2dc0066c980ed1682f089cd93eab640daf2592
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=what+are+the+properties+of+a+primary+key+in+dbms PDF link annotation
    • http://luwogexejel.getenjoyment.net/lutoweb.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/50267572285.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/english_for_business_communication_calicut_university.pdfIn PDF document text
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/vozigoturasinesit.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/45700616431.pdfIn PDF document text
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/8566b72640d6.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/ijZLMjc/45784119847.pdfIn PDF document text
    • http://retamos.mygamesonline.org/73739399744.pdfIn PDF document text
    • https://gonagulinifuf.weebly.com/uploads/1/3/1/8/131856247/4780600.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/dixobuwolemuvizajuwed.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/jeBoijb/assassin_s_creed_identity_offline_or_online.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/17637ee4-d054-4e82-bad9-7f32e8892afe/how_to_write_a_discussion_in_a_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52436e3-510d-4d93-93a2-11c97896ded1/what_are_some_famous_ballads.pdfIn PDF document text
    • http://lexamokoxerum.atwebpages.com/how_to_turn_off_brinks_security_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b809737c-e052-4b8e-a76e-30a60cf9d806/lenipaferididubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8229330a-9e08-460b-9101-e273b4d480b2/guxomubalibokifunulivug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c595c350-10ec-4d67-8f28-e6315be9a856/cuntos_habitantes_tiene_la_ciudad_de_mxico_actualmente.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/3038691970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744ce943-c33f-42f3-b109-a40bf754fab6/30576854196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b88dbd6-9e96-4cd3-b5c1-1ea272f4045e/litaduzopikimuti.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 5568 bytes
SHA-256: 8fa37a79660d9ae998e2de5b0d6ad0171bc8b720715971d73aa258d9fa9c050d
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 11464 bytes
SHA-256: f7ea4cee7733912c124ac22b7be314368f296e36117299b99763bec1a65f436c