Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5b66b185d6841d…

MALICIOUS

PDF

80.7 KB Created: 2021-03-17 13:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 76585976617251642368feaf32ba8a6d SHA-1: d2a341be0824e83cce97c0184989d23047d333d0 SHA-256: 4a5b66b185d6841df995afc0e67640b4b6c98c097742a668936c2bb4a439ba6a
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to redirectors or SEO farms, indicating a phishing or content-luring scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this. The primary redirector URL is https://jottigo.ru/strik?utm_term=how+to+use+ceramic+candle+diffuser, which is likely used to funnel victims to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially involving embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=how+to+use+ceramic+candle+diffuser PDF link annotation
    • https://cdn.sqhk.co/dixejetafap/fHny0y8/jazuzurazidanejokuwafi.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/W5Ujejf/10680776678.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/wanubevanobizom_doxowereduv_liretuf_buvasukum.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovika/gf4Hljj/it_s_always_sunny_meme_templates.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/fapuzosulodopu-demetikiv-wefukezorabolo.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/jfjf5ja/ringtones_siren_tunes.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/hhdRid9/hattrick_youth_academy_guide.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/napub.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/suxiweke/bipikalotenumokura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386d80fc-c387-4f96-a5da-133d3f3475fe/is_gluten_free_beer_safe_for_celiacs.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/25384735887.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/roguzelad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12feadb1-51da-4800-bee5-82728ee693a6/86810451656.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/what_light_therapy_lamp_is_best.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/birthday_cake_images_with_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9750d0ae-2b29-4f79-908d-050fbdc650c8/bewujipu.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/87850015296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbd5172-54de-4106-83e5-a2059f2b43d5/best_free_logo_maker_app_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/dulitivobekuxabegubon.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/army_national_guard_drill_pay_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/giza_dream_sheets_king_size.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/arc_welding_machine_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2b18ef-2ecd-47b6-b867-bf29b7649d4e/jikilisureriki.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_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 5220 bytes
SHA-256: 85bc40cfc419e637d0985257d8fac7c8ab9925bd7000732ddab9010153695e4b
font_01_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 10596 bytes
SHA-256: 9a1dd68de11a4c12c88844bcb6ffcb4710d0b3af7d7ccffaf94d55c343321665