Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d2f6537b847bc7…

MALICIOUS

PDF

87.4 KB Created: 2021-04-08 02:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f91edc761319d8572c6e91516841b611 SHA-1: aac1f27a67775d70881402a86a5345d46ab04bd3 SHA-256: 28d2f6537b847bc7d895b0a0814ef8999a66ab70b12758da0e70f603fb5e9756
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/wix?keyword=ipde+process+quizlet PDF link annotation
    • http://idealicaitalia-oficial.site/51384844987nlh73.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/59708821574.pdfIn PDF document text
    • http://brumbum3.xyz/telugu_dubbed_movies_free_download_2020o69q3.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/minod.pdfIn PDF document text
    • http://zofugef.mypressonline.com/81420044734.pdfIn PDF document text
    • http://pisobadepujo.22web.org/92756215257.pdfIn PDF document text
    • https://xepuzuzolewu.weebly.com/uploads/1/3/4/3/134324818/sidegedimo.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/7f951bb8.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/kizem.pdfIn PDF document text
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/wojakatogem_wapabutapu_mesol.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/4754747668.pdfIn PDF document text
    • http://fapseo.ru/33502272790cqzs8.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/27514064755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redadut.epizy.com/47375396473.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/betrayed_book.pdfIn PDF document text
    • http://girubulofi.epizy.com/puranoxibik.pdfIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/293951451.pdfIn PDF document text
    • http://revipopeguxasaf.epizy.com/el_almohadon_de_plumas_descargar.pdfIn PDF document text
    • http://zijedan.atwebpages.com/zemuwosutut.pdfIn PDF document text
    • http://sazororazinub.epizy.com/91400621812.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/zadomegilopivepuzelimotug.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/how_to_use_nikon_sb_600_flash.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_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 4972 bytes
SHA-256: 61559c33a190fc3f02e98b5b1e1a5679a4b1625b9762d84340ea512363995611
font_01_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 2240 bytes
SHA-256: e34ea6b949d0caf1dd5ee7795971a8cbb2fc66b6c20ad32415fff043e66ce372
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 14136 bytes
SHA-256: c01a841a8944c24bfd39a7e51c5936e4c44e96d3769027bfba8d8d890c0f2c90

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