Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fb4ffb16d1500a…

MALICIOUS

PDF

78.0 KB Created: 2021-06-02 03:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b94e5287ceee7e065a4598fa43e8cbab SHA-1: fcaf0c385f56228c295f9706d741346156e0fa47 SHA-256: b3fb4ffb16d1500a848926c715761aeb6af4e360214b1b99116ddc63723171d1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary URL, 'https://garglob.ru/pbw?utm_term=angielski+dla+pocz%25C4%2585tkuj%25C4%2585cych+%25C4%2587wiczenia+pdf', appears to be a lure for English learning materials, likely a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://garglob.ru/pbw?utm_term=angielski+dla+pocz%25C4%2585tkuj%25C4%2585cych+%25C4%2587wiczenia+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5feeb5d0524c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_60287181c4797.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/jawikerowodolugax.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/2678108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_605efe9d04aad.pdfIn PDF document text
    • https://jeputuzomum.weebly.com/uploads/1/3/1/3/131398597/772273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_602e3cec1af56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_6038be76f406f.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/85850ed46d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_606809966190e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6228e01-7d90-48e6-95bd-c3f02b1cee68/call_me_by_your_name_novel_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8719ab5-c540-465a-9ed4-096bc0ff0b9d/46139056043.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144422661/fill_in_missing_numbers_hundreds_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de085e6-2d1d-4ba7-baee-74e6805d9ff6/orbit_model_57894_wiring_diagram.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144437367/construction_project_closure_report_sample.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144446766/mokataropipumiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76ba25b-1d4d-4474-b7d7-1f59a6cc860a/59496195676.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144466323/dragon_ball_z_tenkaichi_tag_team_para_ppsspp.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144448305/rosojutexitaroti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22fca17-988c-4f31-b040-0880c7d11f13/how_to_reset_restrictions_passcode_on_iphone_5s_without_computer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 6104 bytes
SHA-256: dc6810c09a8e6e98de8899a3e59c005b8c01b05bd31db18aab7377f34fdbe809
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 12396 bytes
SHA-256: a5b452797887271865320e1bbccfea609991e05e77bf9af37c972878b0f86df0