Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b3bf9346e4b874…

MALICIOUS

PDF

81.5 KB Created: 2021-03-09 15:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 104cdeadc09cf8c1f2b3d7f74b26d3c6 SHA-1: dd8e0bd249a06ab14d521fdb202d6b3bc1646894 SHA-256: 43b3bf9346e4b874f46cf0266f1ca677c1e9ac52c8024f963dd761e3569c2632
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=evangelios+apocrifos+borges+pdf PDF link annotation
    • http://wacc-cat.org/zunizobezetejolekx9ms.pdfIn PDF document text
    • http://hookup153.space/tirolanazabugeguladulako878kl.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/18942180600.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/10738913436.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/60984564040.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/bsc_physics_hons_syllabus.pdfIn PDF document text
    • http://lojasamericanasbr.com/rekubarepaziduneseiwa.pdfIn PDF document text
    • http://vzroslyh.net/ic-718_digital_modeswqbxh.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/the_different_types_of_writing_styles.pdfIn PDF document text
    • http://my-credit.info/caravan_drum_sheet_musicunq20.pdfIn PDF document text
    • http://sodabisunuk.22web.org/signs_and_symbols_nabokov_explained.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ropupifalapoges.atwebpages.com/xolubasomufirepusixeleli.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_0d20a6e19dc84bc2a03af7a2bccbf684.pdf?index=trueIn PDF document text
    • http://kekunulu.epizy.com/dawumerutubixedizopona.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_99c6e0d0532d422f8b42be9de4b30183.pdf?index=trueIn PDF document text
    • http://baxiziroj.epizy.com/excel_date_schedule_template.pdfIn PDF document text
    • http://jajogagek.atwebpages.com/sasesefo.pdfIn PDF document text
    • http://romakilax.myartsonline.com/94028919846.pdfIn PDF document text
    • http://rimefuvax.epizy.com/62492628375.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 5188 bytes
SHA-256: fc9855c4e07a76f0f12c5be59214c6e05d496d7f68105c650c84aa22ec9eef1f
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 11264 bytes
SHA-256: 1086e883db2a95c86b30fb0f3e031444d2bc4b9e77828c6bdd445f52ab09f084
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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