Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c688c6a27ab2c0…

MALICIOUS

PDF

76.5 KB Created: 2021-04-29 08:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90b1acadcbed3d63351b217770fcee16 SHA-1: c3afad56bad10ac19e45dfdd0e3a9aaeed86dd6c SHA-256: 73c688c6a27ab2c0f2a15fda3f7ce874134cc37fc212464415f2eaec8624518c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=graco+x5+paint+sprayer+tips PDF link annotation
    • https://cdn.sqhk.co/gutinisiv/NasQEgj/vitamin_cottage_longmont.pdfIn PDF document text
    • http://zuxegizo.iblogger.org/abstract_reasoning_practice_tests.pdfIn PDF document text
    • http://mizarujil.mypressonline.com/gozusuwebonigifuzixup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fe9c10997762.pdfIn PDF document text
    • https://cdn.sqhk.co/japanakoga/4Zjhhhe/possessive_apostrophe_worksheet_grade_4.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/13136649123.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/bidilirikaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_600fb2e70c735.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/21254706801.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_c1a12ed6d6a54a219638fd6df978c42a.pdf?index=trueIn PDF document text
    • http://refusunono.onlinewebshop.net/oxford_new_headway_beginner_student_s_book.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_0bf876ce46f0481ca7c48fd21cf3ed20.pdf?index=trueIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_e9f48eca2bcf4009b82a6cb211507881.pdf?index=trueIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_dbe9d107e55345cc9609477f750b6d29.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_e010a334cc6e421fb9914627ca7b2fd8.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_6c2fafc61719493a9640d6353b0dd9ea.pdf?index=trueIn PDF document text
    • http://zoxutudirufusoj.epizy.com/girl_guides_world_thinking_day_2019.pdfIn PDF document text
    • http://xidatozekef.epizy.com/82479690584.pdfIn PDF document text
    • http://pudegiluv.epizy.com/rawoleritofajije.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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 5220 bytes
SHA-256: 5592e8cc92899f04742e4d7510c2e3a303f585a8096a69080061f96b23eb9e6d
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 10724 bytes
SHA-256: 24a6033236165f56f8a06cd5827ecaab89d344e8a95d2873700402a19e1eb1c6

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