Malicious PDF — malware analysis report

Static analysis result for SHA-256 b525b36a2c7b834b…

MALICIOUS

PDF

75.3 KB Created: 2021-04-13 19:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a4ba575582f7b662df97ef475b20e459 SHA-1: bc701d7daa19141fb9896879b092223cbb6ca890 SHA-256: b525b36a2c7b834b18f066ac6644a1b795dc910a7abcb618d3995682f19c355b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain search-related terms, likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=oster+heatsoft+hand+mixer+reviews PDF link annotation
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/a69d8b.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/hexY0ii/44069770280.pdfIn PDF document text
    • http://mejumeroxara.mywebcommunity.org/70720268704.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/zLfBiiO/nekagudalafagetodol.pdfIn PDF document text
    • http://kuxemanes.medianewsonline.com/99008662629.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/english_grammar_exercises_pre_intermediate.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/cff6837d3b5.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/wjaiioN/rolling_stones_oversized_t_shirt_dress.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zalomi/90763600792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8935ae73-46f5-4400-b960-ace5a458765c/interior_designing_courses_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021867c4-2ae3-48d9-b58b-f7b7f10463f2/what_is_the_first_harry_potter_movie_on_netflix.pdfIn PDF document text
    • http://wuxofiwuludut.epizy.com/banking_system_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/diary_of_a_wimpy_kid_books_tier_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90e2377-2c16-4413-88b3-8372ea5f6149/71875669661.pdfIn PDF document text
    • http://wibapopu.rf.gd/xozarigonumekagugidi.pdfIn PDF document text
    • http://punegisegavugaf.epizy.com/46811679944.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/botim_for_android_4._1.pdfIn PDF document text
    • http://zigexejumex.epizy.com/saint_seiya_awakening_quel_cosmo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/84711119739.pdfIn PDF document text
    • http://xarinibobi.epizy.com/fuvetamexekobulinof.pdfIn PDF document text
    • http://lufevexos.atwebpages.com/liber_sancti_jacobi_codex_calixtinus.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 5364 bytes
SHA-256: 8a0078ba430d573841f1ba012b7508b7372b0cca89e458a60e1a2e5bc1ec8ef8
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 10684 bytes
SHA-256: e16403d4478000f81359a511c5698fb44521ec0596f90321f192f3c68930ac80

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