Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d0f94de6ba5856…

MALICIOUS

PDF

78.8 KB Created: 2021-03-01 16:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 28cdbde370e571030d95e971a602472a SHA-1: 5cd5fd03961fb417618e19624b846d9400ee9f31 SHA-256: 42d0f94de6ba5856886cfb85d6a1f32c150ac39b1b896d591c11e80346cf5109
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', which is a common tactic for phishing or malware distribution. The presence of external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=their+eyes+were+watching+god+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/duxadikoti/jhfkhg6/website_creator_app_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/SCjcMRr/smash_ally_zack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fcf42beb0f73.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/d3wxhag/hello_neighbor_hide_and_seek_download_uptodown.pdfIn PDF document text
    • http://kyukty68.xyz/barmeno_bq_regular_free6anbp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_600bfd27aa3ca.pdfIn PDF document text
    • http://creditreportus.info/angelcare_bath_support_grey75nw4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fe8ac777d985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fcb6a57a7b37.pdfIn PDF document text
    • https://cdn.sqhk.co/taxuvoguraji/y1oKkjj/super_pixel_heroes_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://parolodase.epizy.com/59482889197.pdfIn PDF document text
    • http://xiradev.rf.gd/how_to_get_a_proofreader.pdfIn PDF document text
    • http://boxogegifenefi.epizy.com/keurig_k-mini_black_friday_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/xiwobopimovizevipenowo.pdfIn PDF document text
    • http://pebitezilewabe.rf.gd/basic_topology.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/bollywood_song_status_whatsapp.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/sturdy_autoclave_sa-_300vl_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/gigupavilaxizimowutebaki.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_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 5376 bytes
SHA-256: 953782407659c072c4616a77532361cc6f4555444ed8bd2f281162bd1e12c3de
font_01_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 10160 bytes
SHA-256: 40d244a5e74e105fac48ffa780f415e6f90081d1c6ee18532f3b4e032f6660d4

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