Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fef7d92e613b96…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 10:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7176ade942f936d659604dee336c628b SHA-1: d09d9378be7ddea59bc3bfbd29e10e693e6222a5 SHA-256: 44fef7d92e613b969f536e7b7bf43a654892bc16eb65b93bd7e7e6fe12676fa8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=the+31+spelling+rules+taught+in+logic+of+english+curriculum PDF link annotation
    • https://cdn.sqhk.co/mifijizudi/aLuadji/leather_cargo_pants_fashion_nova.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/idAmlJ7/formet_elik_kap_kilit_deitirme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5fe1c19d3681f.pdfIn PDF document text
    • http://thrivewebs.com/kenmore_ultra_wash_quiet_guard_deluxe_manualbyktm.pdfIn PDF document text
    • http://italywom.space/49756766938r1ubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_5fdebe8b373e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_6023038e0f7e1.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/jbhjIFP/in_flames_pinball_map_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sarokuneti/jegQqjc/clover_dating_app_girl_name_snapchat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_602b4e0d3a586.pdfIn PDF document text
    • http://nature-ital.space/14106021563a1rfn.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/hUmkGop/braums_ice_cream_flavors_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_3606dc6ce43e4f44aaac58611ca86399.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/biosecurity_measures_in_pig_farms.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_a00ea35a4d4b4515aa637a795d5e068c.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_312d8f1ccb424102b6b86800e1cf0a4b.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_343f0aff7ef540b794248beffbca74ac.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_36506671ee52403580f53404e7d60e28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/que_es_un_bosquejo_de_plan_de_vida.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/crossword_answer_for_ostentatious_display.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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 5596 bytes
SHA-256: 66ebe54b7fcb14ec50a9be0da1ecf3ea14f15cca8d1bcd2763b4629d8d821d82
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 11904 bytes
SHA-256: fe83288b972f390447bd5da1ca779f383d9c5cd70dc495df34615af6b2a2ceea

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