Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c7f5cd3e5e2e88…

MALICIOUS

PDF

77.7 KB Created: 2021-03-23 11:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a122d83640a68430aa78b141c4f4f8c SHA-1: 8a8c78de68c92f577343a5eca62bdf79c2aa0f53 SHA-256: 73c7f5cd3e5e2e88bc3992951c9c1e3298b2147aecbc89f352ecf02d53017c6c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=asvab+study+guide+pdf+download PDF link annotation
    • http://tafiwon.mywebcommunity.org/atrocity_act_meaning_in_marathi.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/duduvijijojusukewe.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/learn_to_write_arabic_calligraphy_omar_uddin_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tokexinolelu/oXlhgjj/glow_ping_pong_table_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/icmzo3m/clueless_outfits_tai.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/iew7hh2/99151294927.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/hheqisj/revolico_cienfuegos_motos.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/xeluvijejisunut.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/malebodilinova-badiz-xumimewakivex-balitoza.pdfIn PDF document text
    • http://matemepujibad.scienceontheweb.net/management_of_alcohol_withdrawal_syndrome.pdfIn PDF document text
    • https://kesakoti.weebly.com/uploads/1/3/1/0/131070149/wimipebizedezimeme.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/eVhbhiv/45884661744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/tower_of_the_mad_mage_download.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_82fd584d842642ee83e3c24aa76be938.pdf?index=trueIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_be581d57cd724a33aaa6af92743ce8ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/japovomu.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_3e61ba1849974714a3172353185359bc.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_fc74ee26b03d473684d8e48f2311d9c9.pdf?index=trueIn PDF document text
    • http://bepolujogox.atwebpages.com/advancing_vocabulary_skills_short_version_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/47533703325.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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 5496 bytes
SHA-256: ce5a09e3dea753ecf99504313c0bc43564c7c22623b2c94ab94304bc685aaad3
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 11124 bytes
SHA-256: 58d4661c5d01ee4109c64fd0e2018dbf007f3846656905a94d7f882a3d739bb5

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