Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b27d3583cd6424…

MALICIOUS

PDF

86.6 KB Created: 2021-03-31 17:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 064d644c210fd73bac64770e295b3c11 SHA-1: 096860829fa50888cd9b35a67db052d1f42a9123 SHA-256: b8b27d3583cd642419346d8b53e94ba138639c569ab96da436002c0369639ae7
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or scam lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=fishing+barents+sea+king+crab In PDF document text
    • http://artyom.guru/chinnari_chinnari_chiluka_song_femalesiphv.pdfIn PDF document text
    • http://bestsalestoday.xyz/haidong_gumdo_formsxen0t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6037215d98e59.pdfIn PDF document text
    • http://osummer.space/castle_storm_2_ps4_review40vcl.pdfIn PDF document text
    • http://vnds-v.website/fovibeofal.pdfIn PDF document text
    • http://labiosdewonda.com/456895106105lh83.pdfIn PDF document text
    • https://mivojunap.weebly.com/uploads/1/3/4/7/134720575/deveparesux.pdfIn PDF document text
    • http://pubgmobiie.com/rofidoriz9a2s7.pdfIn PDF document text
    • http://jerikedora.iblogger.org/festivals_of_pakistan_2020.pdfIn PDF document text
    • https://xupugafowepeg.weebly.com/uploads/1/3/0/8/130814457/luxilorus.pdfIn PDF document text
    • http://keepsufi.space/red_dead_redemption_2_100_walkthrough_part_10_beardpei09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_602f7cdfb1e8b.pdfIn PDF document text
    • https://raduwuriko.weebly.com/uploads/1/3/4/4/134454813/direz.pdfIn PDF document text
    • http://youralteragoods.com/64567021435k2im1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finedati.epizy.com/75918365250.pdfIn PDF document text
    • http://solazum.epizy.com/free_house_plans_south_africa.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_6be27d36c0a34f78a78e1059fbf78264.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_e5406047a39343a5af4ff79f46e88620.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_3cb86407bc4148f8bb8f02a9712558ac.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 5188 bytes
SHA-256: 03492cac14598b23acfcd9749dd41f8a73b1f767e7eb66479138aba3a81ef246
font_01_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 11832 bytes
SHA-256: 41595f6bab9f377186c03ddf0ea46b6b14d8f81320786d7cb88fde87b9df549c

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