Malicious PDF — malware analysis report

Static analysis result for SHA-256 d997a7ec2546ae77…

MALICIOUS

PDF

89.4 KB Created: 2021-03-05 09:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 018ef39ab79b835d6a4097817c6a487f SHA-1: 751f341679241a8362f4490c2560b2b07f83debc SHA-256: d997a7ec2546ae7790c9370830435f8aab8b370f39cef9afe820adbe3dc70cd1
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to direct users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a search result.

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://fokemale.ru/wb?keyword=define%20developmental%20biology PDF link annotation
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/7950992.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/iagg4gf/wagigujegowulitu.pdfIn PDF document text
    • https://vavulawukuret.weebly.com/uploads/1/3/4/6/134690424/4ea4e.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/fAVihje/36285092044.pdfIn PDF document text
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/tomag.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/IieQigA/97858657547.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/738429.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/e94cc41e-0737-4ea6-af96-dd29d5a2efc8/casio_g-shock_ga-100-1a1_watch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7ae8eb-dc16-48d0-94ba-a789b989b4fe/66625802850.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_be2743d13db04d05975555983ad6ac8b.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_6a310e2468884df4aab278a0bf54964d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff352331-10b9-4fdc-b7b2-c9bc5a0c4b88/79863565509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e763ca09-7883-442a-af4c-79a778376d44/tojojovudaweferemaxadin.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_a65a320e851849179108ead313d1d5b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/796e050f-ba29-4ffc-a6ab-803a8ae6004d/26765571639.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_2161304dcf204442af687dfa797be82c.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_89fb66ff871e40a8a351b1a4240f9b90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1975ab6b-7d1e-4708-b7c9-f482afec269e/new_rules_of_lifting_supercharged_results.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_ea85bc7366444271a5437438f3d3ee33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d6fb34-cf9a-45aa-9bec-041d20f6415d/sportspower_saucer_swing_instructions.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_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 5388 bytes
SHA-256: ba08ee3c7f2a5a0475dc1342e18002e1fe75703730b8151974796765435099a5
font_01_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 10308 bytes
SHA-256: 46a813a347933288c58890a4c318fbeb47eca09f873435dbaf411ed67e2d933e