Malicious PDF — malware analysis report

Static analysis result for SHA-256 46835b03bbb69a59…

MALICIOUS

PDF

75.7 KB Created: 2021-04-02 01:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3f7d083165068e21816ee0622938059c SHA-1: 08fe835d14626d9d3f786a9d8a1a063d9fceb6fe SHA-256: 46835b03bbb69a59f8f67d43196bf3454ab4f7fccba8e309b2f00c6e37495a4c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/wix?keyword=estado+fisico+de+la+materia+y+sus+propiedades PDF link annotation
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/0a1e5784c716793.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/jhlfhdJ/turbo_racing_3d_old_version_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/g87PhL3/pabepemesite.pdfIn PDF document text
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/gisadizarur_wagadexabaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lofujumixas/haKhdVQ/gazowefub.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/25b8fa097cb.pdfIn PDF document text
    • https://tezexitebab.weebly.com/uploads/1/3/4/6/134600353/cee99603d6.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/hhhbibF/pekire.pdfIn PDF document text
    • https://momosedudufapi.weebly.com/uploads/1/3/4/6/134622660/rapewadakonuxe.pdfIn PDF document text
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/7247735.pdfIn PDF document text
    • http://levantegroup.net/cast_shadow._psdqicyk.pdfIn PDF document text
    • http://50offshop.info/jijibetozoreifqk5.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/Xiii2EY/boomerang_cartoon_app_review.pdfIn PDF document text
    • http://daddytestit.xyz/shopping_wishlist_app_iphonefxa4i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba32601-7689-4544-9d60-0bdc94f1c553/kexamikowojiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f0365c-4c98-4abe-bb0d-4ba183be74d0/graco_milestone_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73dcca60-f958-4fc9-9595-24f61163766b/stellaluna_book_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db80d90a-b154-4024-9fcb-7e617264c909/26918098755.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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 5360 bytes
SHA-256: 218795fc4ddd7c6efe1206120642ffbea3494d6a0b886e3595392fb33ed2cff1
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 11860 bytes
SHA-256: fffdb70f8ebfe6214e1ff54d447b5ae862bf60827e32ef39793325bc3848908d