Malicious PDF — malware analysis report

Static analysis result for SHA-256 0273809dd1fc4332…

MALICIOUS

PDF

70.8 KB Created: 2021-02-26 03:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b8f6089888d3edb7afaceeb6ff94e6d8 SHA-1: 2223c75228694c27e95c387510067d4b0883a6c1 SHA-256: 0273809dd1fc4332a44bce306bf15b2dd9691700f409322c5b820107930f3eb7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with several pointing to disposable domains and potentially malicious content, suggesting an attempt to lure users to compromised websites. The file's structure and the presence of many external links strongly indicate a phishing or malware distribution attempt.

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://crophysi.ru/123?utm_term=strategic+management+theory+hill+pdf PDF link annotation
    • http://springital.fun/diet_for_dummies_11_day_dietvtj41.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/mastering_the_art_of_french_cooking_volume_2_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/jdjd7jg/maze_juice_wrld_lyrics_meaning.pdfIn PDF document text
    • http://reduslimer.website/53663788038sq1v1.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/whjgdjg/nail_salon_prices_albuquerque.pdfIn PDF document text
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/3370254.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/utgfif1/zujavogafef.pdfIn PDF document text
    • http://1xbet-registr.site/909537306773f28u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_601094032efa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5ff7c72d25bc7.pdfIn PDF document text
    • https://cdn.sqhk.co/lilokimoz/hfdnLCt/85697256663.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/tZelidx/movies_coming_out_in_nov_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/jajdgcP/ultimate_r1_mod_apk_naxeex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 5596 bytes
SHA-256: a38cbdf2aa91491905e9a762e8ef47e6a6719db8c66fd4f4d4deac4e39aeb8ad
font_01_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 10644 bytes
SHA-256: 6ab877129d285e17eacfa1c3d1b79eb3ef739c8dc6879df45b62bfbed00b4537

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