Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad965c3f92ded46b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 16:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 319736931005a5cc43c4c7a468c6a3bf SHA-1: 558dc518e738a02afe978465fcf8202d0d9a3d14 SHA-256: ad965c3f92ded46bfa051a2749a219d9458993e0e105bb1371de192840137bdc
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly flagged the PDF. The embedded URLs and the nature of the heuristics suggest this PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=fly+tying+station+plans In PDF document text
    • https://cdn.sqhk.co/wujejelot/gciaYia/patopewufapotakag.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/bFEgfDq/roblox_knife_battle_royale.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/cu8TVge/26135134160.pdfIn PDF document text
    • http://vuvabadiredowa.getenjoyment.net/autocad_2d_3d_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/jhaiijj/puppy_wallpaper_for_mobile_phones.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/61a7fd99-6121-4fcb-879d-85e4d6570b8e/folk_music_english_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3a24bd-4b19-48bd-8879-3bf3e6dd0e93/ravoxekefe.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/how_to_wear_mask_if_you_have_glasses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae16e2ea-2e35-4135-b243-c85f77a16cc6/the_hunger_games_movie_download_in_hindi_filmymeet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa378f3-9102-4ac9-a2b7-635b905f8693/anet_a6_firmware_original.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27c9dd5-8c1b-4b79-a54b-f05ecb3579c2/who_wrote_martin_luther_king_jr_i_have_a_dream_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6297c2-c040-4343-89f8-4ffa4f2c55a9/nancy_mairs_on_being_a_cripple_lexile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d81e63-31b6-415d-857a-4df1ce1f3fab/xikutam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352a5e3c-957f-446d-b53d-2c9ba4537080/2144373694.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/rinodiwogoni.pdfIn PDF document text
    • http://lifokuxebuxama.rf.gd/bixby_apk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8cc9b2-4f65-4175-bfd8-413b94cb603a/25804407854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196ca1fb-8142-499d-b26d-2236d58b1734/zokuladakirisorun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98ee648-2787-4370-8b7b-79df1dea84b4/fluval_406_spare_parts.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/56776706086.pdfIn PDF document text
    • http://visowazugib.rf.gd/junerigojigewixakekodet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430710b7-e0d2-4792-8683-04e5175c495a/hp_probook_4520s_datasheet.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_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 4948 bytes
SHA-256: f5ef5b314941f14f810ccb5cf0f7ed01dd30e8e2003ce5146df2e82d039ff8b4
font_01_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 10764 bytes
SHA-256: de22f19e9bf8d3429b11f288be911ddba6e9bf9c99a1c42195539a7f82bc8227