Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ac4ed2ec46557f…

MALICIOUS

PDF

76.1 KB Created: 2021-03-15 08:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d849fb37a1406a04bef82476eda09a30 SHA-1: 0ae942f513a45f4b1d4caf72732ec45c6e8b942a SHA-256: d1ac4ed2ec46557f0ac06dd45a72d976bae5703478ebf4a1330c9ce9d001c26c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to potentially malicious or disposable domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=5th+wave+feminism+mohammed+hijab+pdf In PDF document text
    • https://jozonoralemepi.weebly.com/uploads/1/3/4/5/134508889/791611b344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_60443fda66326.pdfIn PDF document text
    • https://gezifizisosuvul.weebly.com/uploads/1/3/6/0/136050083/7688689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_6001c6559e54e.pdfIn PDF document text
    • http://fogepadive.iblogger.org/asylum_2005_movie_free.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/wufomugolewat_dusom_nisow_xolomivawarobo.pdfIn PDF document text
    • https://nagewapebikex.weebly.com/uploads/1/3/4/6/134647925/kusudotawato.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/kinotok-zazezifot-gepogexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_5fd1655bb114e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fddacccbad3f.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://juripijesem.rf.gd/10403163177.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/59131455519.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/53321269209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3472928-f439-4c0d-9f4d-629c0fcee11f/70732880024.pdfIn PDF document text
    • http://xadeboni.epizy.com/tanzania_movies_kanumba.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/mebematet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a5f3ca-c29d-4174-bdf7-4bf63349ae61/blackbird_tab_baritone_ukulele.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/white_christmas_choral_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/windows_10_usb_boot_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d9dac2-2821-431c-a3ad-bbe188d60549/xofumufugis.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 5336 bytes
SHA-256: 1a3369481e2e89d9c54b45e454ed157813229cc9fdaccc33be46d3e4fdd870ac
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10416 bytes
SHA-256: 9371e904fc53fd2db02aab0756d18241f6bfbbbcf1058f82867938faa02fd0f5
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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