Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd5428a9fde1189…

MALICIOUS

PDF

81.9 KB Created: 2021-03-26 10:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7214e4dba14c6989733b5fd77771cbad SHA-1: 3b74320283fc5fbebbb2709e3e15b24a2a4f31a9 SHA-256: bcd5428a9fde118945e5bda9dc969f4d1f158f944cf42e387b7f54d0990741cb
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 0.9997

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://zajinet.ru/wix?keyword=leves+of+camp+drybone+bugged PDF link annotation
    • http://wulodab.iblogger.org/nowevonebewafamudafi.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/chKezzH/apple_rewards_program_for_employees.pdfIn PDF document text
    • https://cdn.sqhk.co/dubezaxuviz/UNeshaS/curtain_measuring_guide_dunelm.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/bYyaOgi/xiguruf.pdfIn PDF document text
    • http://nakapugevonisu.iblogger.org/13734701327.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/dJVjdHe/texenugokubewosiv.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/Z0uij4x/truth_or_dare_film_review_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/d2rjejf/dasirupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_f4057b03a93a43ff8dfac3b441551da7.pdf?index=trueIn PDF document text
    • http://xojesulelu.rf.gd/kifegebidaxaze.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/difference_between_centralization_and_decentralization.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/drought_and_desertification.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_c06391d3de644fc5b192874c3a3d4b1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/443c1db1-246a-4ebb-b88a-509224bce622/how_many_merit_badges_for_eagle_palm.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/bebo_bebo_song_mr_jatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5e6d61-94ca-42e7-807e-7c5d07e556be/apj_abdul_kalam_autobiography_in_tamil.pdfIn PDF document text
    • http://nobixemoxuf.rf.gd/a_face_in_the_dark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70df130-576f-4aa8-bd19-686deb8a5876/41047023488.pdfIn PDF document text
    • http://sufiwidixoga.epizy.com/hungarian_rhapsody_piano_duet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb3cce2-8ebe-41d1-bee7-4faed2ce63a9/how_to_solve_cube_in_20_steps.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_cfbf6836c90843308c269e1f19b12cc0.pdf?index=trueIn 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_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 5688 bytes
SHA-256: d90c209315b9454035284576242eb76fef533c0bcee80b4a9868d17ce70d7d1a
font_01_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 10856 bytes
SHA-256: 90bee8093b8706c8eac60deb21574b701ed124fbfe43f0aeec116ce37874a86c

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