Malicious PDF — malware analysis report

Static analysis result for SHA-256 208573093ea435ca…

MALICIOUS

PDF

77.4 KB Created: 2021-04-26 22:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 187ce76f4fad20b72fbbfe84ab29dd7e SHA-1: c0be1110767f2b9f49b54f0473571fc80570f160 SHA-256: 208573093ea435ca5d821e231b8100b038e03ed99344d096ddf1ec7eb1d96f23
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious due to its function as a link farm, directing users to numerous external URLs. The document body, though heavily obfuscated, contains text related to 'baby girl shoes' and the authoring application 'wkhtmltopdf', suggesting a deceptive lure. The presence of many external links, some on disposable hosting, indicates an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=baby+girl+shoes+12-18+months+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477367/normal_5fe4db738bfbd.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/gdheggo/jupewevewonow.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/jgiggjR/93808158433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_600182a4bc00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fe6411d7fff7.pdfIn PDF document text
    • https://cdn.sqhk.co/fubemabofof/aP5NJTy/elvis_presley_greatest_hits_album.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/70btPHD/ripto_s_rage_metro_speedway_orb.pdfIn PDF document text
    • http://dhl-order.info/pixel_car_drag_tune3032w.pdfIn PDF document text
    • http://kupiokno.su/datawamegimigopipeoo0fe.pdfIn PDF document text
    • https://cdn.sqhk.co/bisozowinala/fihWJJ4/67089396574.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/aTIjHjd/belt_grinder_machine_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jinavefajevo/dN6hhhg/41051537394.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/2ilhdhe/little_empire_hack_mod_apk.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/0591e6f5-b8a0-498a-adb2-6ee95ea0e692/reducing_fractions_worksheet_answer_key.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_edaeb44d92df48e389cf20e1e480153d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/125e13e7-5b65-4331-b7c7-0090085aa7d6/kemazupubizuzavemutir.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_8552d3dfb5224aa7ab29ee2d7e82c0a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb52265-5daa-4345-8d74-c56267c341c7/mekaxusojuvix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69039dcb-51dc-4ee1-a62a-009f4582b88d/how_to_label_circumference.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_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 6052 bytes
SHA-256: 4b4ee539f5d7573bb00d0279c921ff884dc8d040b0c47ad8c679eceef6f938ca
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 11012 bytes
SHA-256: c2ff3689617e6a590b0c45adc24db905b1ece1a95fabc7eed3ac70d93f8a1835

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