Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14c6976745a5216…

MALICIOUS

PDF

116.4 KB Created: 2021-03-22 05:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ac6501a459ae39513550f09d0fee909c SHA-1: 9388d94e7d042347d0a9647f423079a37d3dbb66 SHA-256: d14c6976745a5216c948113b875ed587f755beef441251e217d954fe5c229882
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/award?keyword=adjectives+of+quality+quantity+and+numbers+worksheets+pdf In PDF document text
    • http://lightstart.xyz/28465330050rooja.pdfIn PDF document text
    • http://songkfrk.site/how_to_check_motherboard_is_working_or_notk3yyu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_604dc912d959b.pdfIn PDF document text
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/kasasimer_neranatibuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_6033b60ff2cf6.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/5a647.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/746947741961jn2c.pdfIn PDF document text
    • http://ipatovaalena.ru/how_to_stop_emotional_sufferingmfrvo.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
    • https://s3.amazonaws.com/potamotaz/lirekadak.pdfIn PDF document text
    • http://gijalodev.rf.gd/tom_s_hardware_graphics_card_performance_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/being_single_and_happy.pdfIn PDF document text
    • http://letozin.rf.gd/android_photo_recovery_software_for_windows_7.pdfIn PDF document text
    • http://zivobojunoloma.epizy.com/mulelaviwupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09849e7-5c72-4e47-90e0-f8d0ae45c04c/business_communication_today_14th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/fairy_fencer_f_dark_advent_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161e0b89-0502-42db-b743-f574d1771b9c/2012_harley_davidson_iron_883_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/44745141696.pdfIn PDF document text
    • http://nijopupeboxisa.epizy.com/hannibal_movie_free_480p.pdfIn PDF document text
    • http://xokifanubede.rf.gd/english_alphabet_worksheets_for_kindergarten.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17380 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off00017d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7A 5928 bytes
SHA-256: f01e4d61794d70a4f20763954c4fc3d74965481a7f383990b8c2cff43acfb005
font_02_sfnt_off0001918a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1918A 10920 bytes
SHA-256: 660d733338563bda48fcdf62773303ceb7acd3f0da2a4dfeb59f6f1b71d1c58a
font_03_sfnt_off0001b58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B58B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3