Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f090b8691d06f0…

MALICIOUS

PDF

75.8 KB Created: 2021-04-17 18:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 596c6feb97877a31dd21f6538fc917dc SHA-1: 73aedbdec18193f1020acde52c043981f9ea5927 SHA-256: 16f090b8691d06f01b89119dc43a435da5dbad10eda7f64dc88e7d9060b304ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=what+is+the+meaning+of+degradation+kinetics PDF link annotation
    • http://xopijodujakik.22web.org/angela_lee_duckworth_grit.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/pXhcia5/ncert_solutions_class_9_science_chapter_3_notes.pdfIn PDF document text
    • http://zipogagu.iblogger.org/werixowifeted.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/xfhgvjc/alienware_laptop_giveaway_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/CN2icKE/91281421856.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/60142113379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonurupadul.atwebpages.com/33393253057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30527f6-208b-43e8-99f9-1cdf35fdf3c8/15950779305.pdfIn PDF document text
    • https://8c330184-3457-40de-b162-e34763a77ed1.filesusr.com/ugd/0aae61_ba990ae4845242eab776734b0310a280.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_c406d456f6da464e9041efbb5a0a426b.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_5d67e92f61c6497a8dfadfc0a5630d1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fa479c-d62a-49b2-89c9-f202bc932112/project_management_software_review_reddit.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_75554e51030c40bcac3b7e98f4ccf33c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bfafb4-f4f9-4926-94b5-cb3d79520960/stan_getz__joo_gilberto_the_girl_from_ipanema_letra_espaol.pdfIn PDF document text
    • http://vogidide.epizy.com/calendar_with_week_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14769d6-8e6b-43cb-a917-a7ac426826de/52607360037.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_6f32b851cf0545dbab3c21b783fc28e9.pdf?index=trueIn PDF document text
    • http://jugefewaxuxuf.epizy.com/ctet_2020_question_paper.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_48e129e821ea4c68976b9ff88cce7b5b.pdf?index=trueIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_81496a78a0ab47f0b351ad615480a0c7.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_d74d762da3fd48638815eb5f83de83ef.pdf?index=trueIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_68d6fa398f22423ebef2fa2ec3ee3e6c.pdf?index=trueIn PDF document text
    • http://tivijovu.epizy.com/teninokisawenedide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29860152-0d86-4e6d-b086-c9339ce74db1/pablo_neruda_poemas_de_amor_para_dedicar.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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 5480 bytes
SHA-256: 24db5a474c744337d8d4bb9081c95a68aeacabe56b3c358cffdef145c6902419
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 12056 bytes
SHA-256: 5cbc7e50b8abd89fe1570f9a514bd883629b97296b72567d1f392d83416855fa