Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc486e50dc9d1256…

MALICIOUS

PDF

75.0 KB Created: 2021-04-13 22:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: adc608738b0ae649ab1aafee86026479 SHA-1: ed337a765f607815f4ce414c2588d20d82722495 SHA-256: cc486e50dc9d12564e5a23e51c42cb8844386fa40a43330e003b070dc237beac
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links pointing to various domains, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'SEO_LINK_FARM' heuristic indicate a likely attempt to manipulate search engine results or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=solving+linear+equations+word+problems+worksheet PDF link annotation
    • https://kirimobo.weebly.com/uploads/1/3/1/0/131069812/sodijazuxatig.pdfIn PDF document text
    • http://latuha.com/bittorrent_apk_android_2._3lvgo1.pdfIn PDF document text
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/pewino-vokamusubuv.pdfIn PDF document text
    • https://fezewemekerod.weebly.com/uploads/1/3/6/0/136050953/801136.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/meaning_of_political_economy.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/261370.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/how_to_secure_android_app_development_quora.pdfIn PDF document text
    • https://bugagage.weebly.com/uploads/1/3/5/3/135330359/webewojusetasi-ralabetuxatem-kuvurilo.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/47517960638.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/fojukelatubefipoxi.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/diderikok_jitonujaxuligox_papene.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/96916139920.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/33317514150.pdfIn PDF document text
    • http://favarorul.iblogger.org/washington_hunting_regulations_2020.pdfIn PDF document text
    • http://hushseo.online/joteruretovozegarosovaxug0gwe1.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/bojepidugodunepidesi.pdfIn PDF document text
    • http://dnepr24.info/did_the_babylonians_believe_in_afterlifecciqg.pdfIn PDF document text
    • http://trelon.fun/vapajobapr8erg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diverozisutujew.epizy.com/african_swine_fever_philippines.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/2512875499.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/tijutok.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_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 5960 bytes
SHA-256: d5b86762cfecef0897be7f469539cba5f998dc3499f1867618090c735d42a086
font_01_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 10852 bytes
SHA-256: 238053932c1278eedd8f732d4e55f4e544b60c57b50f132ca16d3fb2a14334dc

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