Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf43aa5844b3f8d…

MALICIOUS

PDF

84.1 KB Created: 2021-03-15 23:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1a73c8a47ec05037f3d46e60ba783f9f SHA-1: e5210f69584d71391ce02ff6e643a271bc1256bb SHA-256: ccf43aa5844b3f8d665139fb96ca7af0a41129077fba344e2bdc68822c36f93d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://midufefew.ru/wix?keyword=kobalt+kst+130x-06+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491723/normal_601bd0cc655fd.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/e05hdid/zesowusageraba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_6046f892d026d.pdfIn PDF document text
    • http://revujutipisan.22web.org/fresh_frozen_plasma_transfusion_guidelines_aabb.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/25170772122.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/what_are_some_synonyms_for_great.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/cibjjhd/afreecatv_english_gsl.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/ihhgTSf/stickers_for_water_bottles_redbubble.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/Vgj7bWS/devagixupeni.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/65263259455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_604e5cb69a509.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/gTpjeCw/roblox_dinosaur_simulator_promo_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rosafipex/tjgy7ub/rojamovuvaruli.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/Gl0gdHU/moroximomazuvedogakupoza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454054/normal_60097dfa2a630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_d5a95af38d0e4443adacfd629f8105ad.pdf?index=trueIn PDF document text
    • http://wigunegulawiko.rf.gd/wave_your_flag_english_song.pdfIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_ba2701f74a33466597ab72be8f717610.pdf?index=trueIn PDF document text
    • http://josesomesube.myartsonline.com/what_is_the_difference_between_the_enlightenment_and_the_great_awakening.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_641ccf243df24f1f9e73bc6e39ced3b6.pdf?index=trueIn 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_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 5520 bytes
SHA-256: 2f604c5d20facd66072652366dd8afe79e269b49b47f68562c09f47518751ac3
font_01_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 12648 bytes
SHA-256: a9bf0cebf683e6c6fb658c81d283576d05575f4aa45ec737b1b45a786110e2d4

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