Malicious PDF — malware analysis report

Static analysis result for SHA-256 29241b9cfa75b399…

MALICIOUS

PDF

77.4 KB Created: 2021-05-04 06:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4cc33c7cf85f425fa02be882582a38d0 SHA-1: 2e0c916b54e287a3ca90608b71f58efbb65c3db0 SHA-256: 29241b9cfa75b399a32055547e688f9222c01942b4ed75dd6c44bce3102cf5bd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document's content, disguised as an 'electrons in atoms review sheet answer key', is a lure to direct users to these malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://pelibifir.ru/strik?utm_term=electrons+in+atoms+review+sheet+answer+key PDF link annotation
    • http://bixekakazozerol.mywebcommunity.org/wiseguy_book_free.pdfIn PDF document text
    • http://kurisuk.22web.org/34339989960.pdfIn PDF document text
    • https://robiduvasolowa.weebly.com/uploads/1/3/4/6/134657162/9304324.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/7479457.pdfIn PDF document text
    • http://iuts.space/kyocera_c6730_unlock_sigmac4wxp.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/echo_srm_210_carburetor.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/0YieYg4/45893280546.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/l0HHijd/wavelet_headphone_specific_equalization_pro_apk.pdfIn PDF document text
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/143a02bd07b961.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/satanaridojuwa.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/atherosclerosis_download.pdfIn PDF document text
    • https://rixexumig.weebly.com/uploads/1/3/2/6/132681576/3602659.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/historia_minima_del_neoliberalismo.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/hernia_hiatal_sintomas.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/fupupag.pdfIn PDF document text
    • http://idealica-itufficiale.website/gokomovovoloraweryr38w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bipegokatif.onlinewebshop.net/renin_angiotensin_aldosterone_system_review.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/xamukiridudadidenit.pdfIn PDF document text
    • http://burekopuz.rf.gd/guxedex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 5100 bytes
SHA-256: e9c031da9904b8d768a3ce942ba5c977d2cf9ec049350f9f21508547dbd268aa
font_01_sfnt_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 11140 bytes
SHA-256: 1020d9969956db7a297691d24174ac85a91ca706c9c9623e701327da26b3fa7c
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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