Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c520e0ccfe4d97…

MALICIOUS

PDF

132.6 KB Created: 2021-03-20 17:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3e401e0215952b0dbf5be3fd1a674507 SHA-1: 50cb0f414a29a2a526ac9bc6a0a5e8ec536fad32 SHA-256: 75c520e0ccfe4d97bde8955bbca47beab7add2c696375ed1d1e9f982080de2a8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as a phishing trojan. The embedded URLs likely serve to redirect users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/award?keyword=reinforced+composite+materials+pdf PDF link annotation
    • https://vubupegizisave.weebly.com/uploads/1/3/5/3/135315261/libufujejadakowilola.pdfIn PDF document text
    • https://cdn.sqhk.co/tirekidifole/jbgEThL/14021908658.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/tunirineledak.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/jane_eyre_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/fidisutipamu/maYJia9/98311241154.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/anatomy_and_physiology_10th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/COk8pgj/sadeketop.pdfIn PDF document text
    • https://refodalisa.weebly.com/uploads/1/3/4/4/134437853/tavajawinera-galip.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/kidoru.pdfIn PDF document text
    • http://zilijakal.iblogger.org/punenisu.pdfIn PDF document text
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/8b7d04fc.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/2Pjibgc/monelilafukewofu.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/h0Uhbjd/street_fight_gang_war.pdfIn PDF document text
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/fubivuxonotilukoz.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/b01a6f7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukanebesiva.atwebpages.com/guitar_songs_for_beginners_electric.pdfIn PDF document text
    • http://tuzipegubeluwo.epizy.com/wenadevotozerone.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_a19db5426047442ba377069c935a04a6.pdf?index=trueIn PDF document text
    • http://vimixof.onlinewebshop.net/kexelotekijow.pdfIn PDF document text
    • http://folujas.epizy.com/99399546887.pdfIn PDF document text
    • http://kugevifeziv.epizy.com/gosubadufujutenavaguvatu.pdfIn PDF document text
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_57401bfe6f644acc9d4787b7db6e0014.pdf?index=trueIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_33af301be81f4b41b53d2c79f4f608ec.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001e7f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E7F7 18300 bytes
SHA-256: d458e3eec1ab422be4b860eebf2d4deb0c18494135e9cb7daefa7d3cb699e1d9
font_00_sfnt_off0001a6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B6 5308 bytes
SHA-256: a4935cf71c9b45a84b9bbd3a0febab885cf8338d9046913a275737933df87375
font_01_sfnt_off0001b8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8B3 14368 bytes
SHA-256: 9ded541bfec0468ba90766fa1169e93372f47a91ec5f3c3bb0e277bc6fdc2116