Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b85e517b1d0a4bc…

MALICIOUS

PDF

72.7 KB Created: 2021-03-17 23:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 96a96aa7884f619ee51eab90fc8c85c4 SHA-1: d4b95eeb5628e3454874803094a139659e2ff130 SHA-256: 7b85e517b1d0a4bcb933ef8118117f82c00694c9f805382589a51a49bc5bca49
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://jacksth.ru/strik?utm_term=rodan+and+fields+fast+start+2.0` is likely used to redirect the user to a malicious site, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=rodan+and+fields+fast+start+2.0 PDF link annotation
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/2724485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fca07c9e22f8.pdfIn PDF document text
    • http://rajajime.mypressonline.com/82889052188.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/51825935333.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/dell_inspiron_3520_battery.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/dulipigudur.pdfIn PDF document text
    • https://sefadibewotova.weebly.com/uploads/1/3/4/0/134018483/5673922.pdfIn PDF document text
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/doduruwixadipi_raripofezok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_60358a2d20202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_5fcc42d11e229.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/zirebupaxiwegivowa.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/xaguvedeguwilepaxexe.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/pevarijidasalop/best_bollywood_background_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/my_nail_gun_stopped_working.pdfIn PDF document text
    • http://bemabam.myartsonline.com/devixatuzojekaritukesopo.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/34719032140.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/a_christmas_carol_film_actors.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/gogaseseduxinu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/xisavunuvutekubabid.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/81867858441.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/10355118302.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/46452892759.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/swoly_bible_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/hdfc_ergo_travel_insurance_claim_form.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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 5212 bytes
SHA-256: b864c3bcfbc5dea1dcd344ebb00a3ec93dc919e964c17db3c03e3670b5a0ae51
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 11644 bytes
SHA-256: 41fa6a01b429a40b577302b1e02a588c72cb3bbb3d2311efe5d6fae95c30486c