Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8081f92e4a10c4…

MALICIOUS

PDF

75.3 KB Created: 2021-02-11 03:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ddf76298ff948ed1a064657579d72a62 SHA-1: 4e7664927dde5e25af64a591a1f32416b8549be2 SHA-256: ba8081f92e4a10c457a462646f48ea10d77eb66fe4be063b0bfce26861fc4cb9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, potentially as a lure for further compromise.

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://bologen.ru/123?utm_term=the+outsiders+full+text+pdf PDF link annotation
    • http://tibujodokerijer.22web.org/3808562272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_60245e6bb4a09.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/9910699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_60141fbec9750.pdfIn PDF document text
    • http://gikufozufuze.22web.org/cae_speaking_practice_test.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/jiranomarupor-vijazitibabiji-juxuvobax.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/nesewixizolukuwomep.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/lubeviboper_mibilesi_wipikemufoki.pdfIn PDF document text
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/1024155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5fcc0ce71c075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_601d2c92563f1.pdfIn PDF document text
    • http://xelipev.22web.org/filazekelovidunevaze.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://kurejaj.epizy.com/axolotl_salamander_care_sheet.pdfIn PDF document text
    • http://lumaxixi.epizy.com/gourmet_traveller_restaurant_guide_canberra.pdfIn PDF document text
    • http://dosatetirudipu.epizy.com/71555258806.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/wezoma.pdfIn PDF document text
    • http://dejedizanabi.epizy.com/blank_guitar_chord_sheets_printable.pdfIn PDF document text
    • http://wotujemun.rf.gd/bepanah_serial_song_ringtone.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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 4712 bytes
SHA-256: 12ae5e9c5e401f0b0c581d3b6cd3ac282a0b1a6e2ace5b8e70d9e2cacf6876bc
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10012 bytes
SHA-256: dd5da252ca1cd48c5892fdf797c0d88bf74ea6ec1db87b211b1a0eb4f1fae083
font_02_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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