Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eff16b14c2ad258…

MALICIOUS

PDF

85.3 KB Created: 2021-02-05 12:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 88c71bb142713b16f2291ce6d07e9199 SHA-1: 150d612b85d36d460177ce0275d5546825c4252f SHA-256: 5eff16b14c2ad2587923c059cb348fbf08d32666d8401fca0dc70e62920b0b28
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content.

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/aws?utm_term=kumano+kodo+self+guided PDF link annotation
    • http://art-practice.org/wapizuwulisugezawazubaxork7v0x.pdfIn PDF document text
    • http://fullpisetc.ru/pearson_precalculus_textbook_9th_edition1xqdx.pdfIn PDF document text
    • http://tajevis.22web.org/android_tv_play_store.pdfIn PDF document text
    • http://barbanapoli.moscow/mewexamujotuxuv3fm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470205/normal_5fe117885e46e.pdfIn PDF document text
    • http://dressnbuy.com/high_performance_habits_clarity_chartywjt8.pdfIn PDF document text
    • https://tipidaxu.weebly.com/uploads/1/3/0/7/130739537/namopogikuwo_dujufidopukujor_liwepen_rutut.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/5514695.pdfIn PDF document text
    • http://yarrebitteh.online/michaels_cake_decorating_classes_rochester_ny89stz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_600b5eb3c0505.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/gedemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365636/normal_60021f3d52813.pdfIn PDF document text
    • http://axecheat7.xyz/heizer_firearms_pocket_45we8dm.pdfIn PDF document text
    • http://reduslimitaly-official.website/tizaxinoxenumaxitajerpxnk5.pdfIn PDF document text
    • http://tophomework.space/179397104214na04.pdfIn PDF document text
    • http://koprovk.xyz/angles_formed_by_intersecting_lines_worksheet4fky6.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://nitovotiroxe.epizy.com/technical_report_writing_course_syllabus.pdfIn PDF document text
    • http://delupujak.epizy.com/chloroform_extraction_in_water.pdfIn PDF document text
    • http://zazufazujinuzo.rf.gd/gmail_bypass_apk_for_android_free.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_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 4968 bytes
SHA-256: 1566421803df740502a2faf2bc9e93e81433d538af4518e53375e119b107ee2d
font_01_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 10044 bytes
SHA-256: 1f32c5103d685b080b0d4cba88b591ba5dcd10a6962ad3aac2f47a861dc99464
font_02_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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