Malicious PDF — malware analysis report

Static analysis result for SHA-256 98874500c01c0f15…

MALICIOUS

PDF

83.3 KB Created: 2021-03-11 13:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9abb41ec4610cb500af4cc6c37a71f31 SHA-1: 95d247b281d10d3205c8a3f8725a5c01546e4a99 SHA-256: 98874500c01c0f159c8a1d8522919772503d8d8ef0ae3c8181a5fdc69e426241
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique commonly used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to disposable hosting and external URIs suggests a link farm designed to distribute traffic or host phishing content.

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://kuzutuzo.ru/wix?keyword=capitalize+southern+belle PDF link annotation
    • https://cdn.sqhk.co/bimerolu/heFigdr/love_nikki_dress_up_queen_cheat_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410462/normal_5fec941f479f3.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/jhimjcY/photo_editor_app_for_android_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/KhbNdid/keyboard_hot_swappable_switches.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/ggTjejb/my_smart_move_customer_service_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/xgfE2gd/cpro_used_and_free_stuff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdf308c2e922.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/Djjgdgh/out_of_the_loop_meaning_in_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_602e59fd97ac6.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/lged3Ua/xatutizixasolupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5fd72a56cb8da.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/yrW43ig/jizazolumuvuzufoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/c2ji9Wd/disney_scandal_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/dajgAWW/survivors_the_quest_cruise_ship_update.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_79f6d607c108480598fa3e17486049e8.pdf?index=trueIn PDF document text
    • http://poradenojipedu.rf.gd/oh_saki_saki_song_bestwap.pdfIn PDF document text
    • http://kopozuputerud.rf.gd/how_to_do_a_self_tarot_reading.pdfIn PDF document text
    • http://kesewoge.rf.gd/gawixakurupojejaduxog.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_7a0e770fee8a44f79d516c8989fe74df.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_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 5000 bytes
SHA-256: 9ba7de3f75d90cbebd4b45c70695aa99a1953b6ba888449a24376b475ff9c04b
font_01_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 10244 bytes
SHA-256: 8947e150deb00c05cbf33b74a20fc2ecfbe2317414d6d4b7f665684f14d5826d

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