Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33f00405219f2f4…

MALICIOUS

PDF

75.1 KB Created: 2021-03-21 05:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22fedec58e0677824533012d26687d80 SHA-1: e6fe12282b19a9268767975cfb1361590a4348ca SHA-256: f33f00405219f2f4fc60ebb21d1069a44d8feadf828db3a18c2e4958ec01c6a6
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, with one pointing to 'lozipotod.ru', suggesting a potential link farm or redirection to malicious content. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=concrete+mix+design+m30+grade+pdf
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/zolidawekebor_dukibe.pdf
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/vudoxoxube.pdf
    • https://sakavafufegig.weebly.com/uploads/1/3/5/3/135323197/dab0c96b2e459.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_60367e2e829c5.pdf
    • https://cdn-cms.f-static.net/uploads/4492600/normal_603d34f2541d1.pdf
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/kodabenasin_sizelul.pdf
    • https://cdn-cms.f-static.net/uploads/4487662/normal_6039a3c313ddb.pdf
    • https://cdn-cms.f-static.net/uploads/4408330/normal_6046a5a507d9a.pdf
    • https://cdn.sqhk.co/goxobuve/9ajdYgd/gasapomenedebisegasutorad.pdf
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/doxakadujofipa.pdf
    • https://cdn-cms.f-static.net/uploads/4501962/normal_6031f7197dfe2.pdf
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5fcaa140f1265.pdf
    • https://cdn.sqhk.co/famagafe/Qiepjae/76625925037.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefomojuwet/82669765943.pdf
    • https://s3.amazonaws.com/vefagotoje/best_tantric_music.pdf
    • https://s3.amazonaws.com/zoxewudunigus/how_to_reset_firestick_remote_when_frozen.pdf
    • https://s3.amazonaws.com/xakajoziwibi/royal_commission_on_bilingualism_and_biculturalism_report.pdf
    • http://bujovozojavisi.rf.gd/why_wont_my_motorcycle_shift_gears.pdf
    • https://s3.amazonaws.com/dabatisew/free_addition_worksheets_without_regrouping.pdf
    • http://luxotenudiwuzu.rf.gd/engagement_party_invitation_card_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e587.bin
ce86a822ca9f33e7e7e989de7e722c6e2b32e1eb693a5cdab65d75d841a9ffe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 5720 bytes
font_01_sfnt_off0000f8ec.bin
d2d8ee86823a3f136690f1e191fd9d9f507812479a98fb0c19c2460aa71e14e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10740 bytes

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