Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8488973f56f47f…

MALICIOUS

PDF

77.9 KB Created: 2021-06-01 13:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0f99c3d34209beff6ff2be98cd227928 SHA-1: 17b5b0b7cca11563a38489a6c81b6c0bf789a38e SHA-256: 2f8488973f56f47f092d71e62067822f48bfa32ca4466f80eb596e0539740833
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. It contains numerous external links, with one prominent URL pointing to a domain associated with phishing lures. The document body, though partially corrupted, suggests a topic designed to attract clicks, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://krisoc.ru/pbw?utm_term=what+happens+after+99+years+leasehold+in+singapore PDF link annotation
    • https://wawisutifefot.weebly.com/uploads/1/3/0/7/130739430/4182632.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/morazikugesokap-lovaxifuku-lulejerufavaka-pibavixevozeviw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470843/normal_605b1786538c6.pdfIn PDF document text
    • https://tejalegevususo.weebly.com/uploads/1/3/1/6/131637178/romapexoloxit_nupejaw_muzovafinoroz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_603ac4976f593.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/486194ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_605090589c3fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5fc75f4ce0e1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367273/normal_5ff109e65467d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisukafetif.pbworks.com/f/why_was_the_fugitive_slave_law_of_1793_considered_a_danger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b244ce-10dd-4940-9a4b-3fc2823889d0/how_to_take_a_plural_verb.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144437877/19045312377.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412455/zurudexuvekivojodimone.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426462/mit_lock_picking_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62b3276-b082-4f6b-9b79-4c93d326cfb3/timamevogoxili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da30694e-c2a5-4915-86ff-9798ab8bcc73/is_usps_shipping_internationally_right_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69f25fb-2235-44cd-936d-a68f1c2dcecb/vozizit.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/1776_musical_libretto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460f0b33-0ee3-450d-8c1e-a609fa481586/84758766799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7995339b-a716-48e9-883a-93029fee6c0a/what_does_the_word_wyrd_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b828d8fe-46e3-4b93-a4c2-1ac179f030e3/tizakenenatasiliruzal.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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 5572 bytes
SHA-256: aa6686cb8e5680a6adef0ebd5dd1965d4a9ec5c053b01155402aebef9af34892
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 11536 bytes
SHA-256: 8adbd5232bd8028fda7b46352d1024036742bc112370bd7a5973f37409483f4d