Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0da5959e92b6147…

MALICIOUS

PDF

70.3 KB Created: 2021-04-04 08:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a647ae48565ba837e863b29cb5e63f07 SHA-1: e87780ca6472e2f74dbb08185ee8c38ae5c74e15 SHA-256: a0da5959e92b6147921bbfa55ded924281e0144eb79023273a67ff01cb63c2a1
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, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=subject+and+object+pronouns+worksheet+grade+2 PDF link annotation
    • https://cdn.sqhk.co/muribirigim/ebjc9ig/podofirivet.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/frifjfw/birds_of_prey_trailer_review.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/MBkxjb3/small_business_start_up_costs_spreadsheet.pdfIn PDF document text
    • http://fikowadem.22web.org/historia_de_las_bacterias.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/ajbioEe/the_hindu_business_line_epaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_457078633e724f219eb5c78bf844c380.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_5536069ff7c64a059b5ded4f326bc4e6.pdf?index=trueIn PDF document text
    • http://bukusisege.rf.gd/bafg_antrag_formblatt_3.pdfIn PDF document text
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_5a68e5aa4eef445eb17146a4a9b2830f.pdf?index=trueIn PDF document text
    • http://vaxikexuso.rf.gd/l_art_de_l_allaitement_maternel.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_66048fb2a3734a86bc2e3a3a396677cf.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_3ae37945cf6045909d5034029e3d3c7f.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_a03c616dec9f4dbdbd86973ee3b5294c.pdf?index=trueIn PDF document text
    • http://xejipej.rf.gd/dark_souls_2_dex_dual_wield_build.pdfIn PDF document text
    • http://kimises.rf.gd/2895591286.pdfIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_211e389a24984f7483ef1719e87b9666.pdf?index=trueIn PDF document text
    • http://xurukat.rf.gd/bounce_tales_red_mod_java_game.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_08dfd012493e47f1a305d6b38752406e.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_8538eb87b6b34eada85699e987143c8d.pdf?index=trueIn PDF document text
    • http://kuxomexepus.epizy.com/asus_my_library_app.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/feeling_lonely_whatsapp_status_video.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_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 5908 bytes
SHA-256: f8478ea92f9a123f70e7ab03ad20a908749558fbcd5f577ed1e5fce585e4992e
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10996 bytes
SHA-256: 6045521fc1065ef89f847077f32e8b32c0f0d58e6df4e9283897eca729a68790