Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0a3d1391a18497…

MALICIOUS

PDF

83.6 KB Created: 2021-03-03 23:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 11bd7aa62bf59121ab2708c4fee9b2f9 SHA-1: 2bf1788d94f84bb821bf4d705884a1b5121cd5ee SHA-256: 1f0a3d1391a184975d52ad5a2ab500325d55509862bf86c6e76ed8032949bd6a
196 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-optimized and redirect to potentially malicious URLs, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The primary malicious URL identified is 'https://jacksth.ru/strik?utm_term=small+engine+repair+certification+programs', which is likely used for phishing or to deliver a second-stage payload. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=small+engine+repair+certification+programs PDF link annotation
    • http://mjawebdesign.net/vutatinojofemiregixixobizou9os.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/turnigy_9xr_pro_simulator_usb.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/0a6ea1a4.pdfIn PDF document text
    • http://gatorama.fun/astrology_for_the_soul_jan_spiller_phz55c.pdfIn PDF document text
    • http://klossheff.xyz/23824485471a1wym.pdfIn PDF document text
    • http://finansi-7.online/647066695696n9a4.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/2545074.pdfIn PDF document text
    • http://mbfsopg.com/how_to_open_maytag_maxima_washer43msj.pdfIn PDF document text
    • http://ridunculus.com/oxygen_concentrator_mechanism_of_actionh9hoj.pdfIn PDF document text
    • http://copyrightshelpscenters.com/disneyland_resort_paris_case_study_answers9vtfi.pdfIn PDF document text
    • http://noncomform.space/dejotisgbfsj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/crystal_reports_10._5._2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/aerosmith_dream_on_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/bhojpuri_video_karne_wala_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/c_code_blocks.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 5436 bytes
SHA-256: 84387836d48a30bb2fce1dc4d0f14a141481e768c7701520b001a50138c8e830
font_01_sfnt_off00011b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 11052 bytes
SHA-256: bc91536f21e847bb94d35c4a7a2286ffbaf6f8ed16a4fd21844f825cb2a5e08d

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