Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52efc84ef0883cb…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 19:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b84ce77530dfee0126d9b3aa0d26b72b SHA-1: 352e2f9ca4f759a56db8e1ef5f6135788d46c3f6 SHA-256: f52efc84ef0883cb25852e293125c196a380ddbeb46ec5d60c2d14cff9c8275f
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of links pointing to potentially unrelated content, likely for SEO manipulation or to host phishing pages. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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=vita+spa+reviews
    • https://cdn.sqhk.co/sojowidaz/hdmIdih/12926934488.pdf
    • http://lipexifinidoda.scienceontheweb.net/98802786692.pdf
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6010704b390ba.pdf
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5ff713a28674e.pdf
    • https://cdn.sqhk.co/zofizitene/Zmihahd/horaire_lpp_csdgs.pdf
    • https://cdn-cms.f-static.net/uploads/4471481/normal_6011abbf62160.pdf
    • https://cdn.sqhk.co/vifamepupib/ibghjcv/love_quotes_in_spanish.pdf
    • http://tobufupevujuma.mygamesonline.org/advanced_vocabulary_words.pdf
    • https://cdn.sqhk.co/bupabumo/cjjgfgd/ai._type_bot_keyboard.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_e10d9245c05447f1b51775bbc1d4498f.pdf?index=true
    • http://nadiripu.epizy.com/bridal_makeup_2018_video.pdf
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_f0e579062b76448882cf7ca2ed3c5b7a.pdf?index=true
    • http://koriwironawuva.myartsonline.com/aqa_a_level_english_language_student_book.pdf
    • http://paguxesij.myartsonline.com/9013992776.pdf
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_b8cfb34394764a30b7cf54e372c8fbfd.pdf?index=true
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_2ee081e159d7405ea19ab614ef7e2b2f.pdf?index=true
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_30983defcafd4842b8751a8f3a8d0f03.pdf?index=true
    • http://xirexadugimog.atwebpages.com/zafimowunusaxabobapeso.pdf
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_dbbd22e6dba64fc794698e2438c09f8a.pdf?index=true
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_12eb138a5aac4aa4a7f04147c4929b93.pdf?index=true
    • http://jijalikutigo.epizy.com/59619683731.pdf
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_f221f83e599747c193ec57e46e330476.pdf?index=true
    • 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_off0000eee5.bin
eccddf1654d69e9d3afd80f371b5d8bee02122e2efbbbb7502708fc8732295a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 4900 bytes
font_01_sfnt_off0000ffb5.bin
d6444ddbfa91d101c04daa6e6ac06921ad6efc7aaa1196c31f1261cf99a0b94b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 11296 bytes

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