Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3362f7e521753a…

MALICIOUS

PDF

88.0 KB Created: 2021-04-07 21:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 890b35f7235a8a536d4412db92ca8fa3 SHA-1: 0b907c963bb3759573c633557286ff5488d69e72 SHA-256: fa3362f7e521753a4c2a8e76c77ef0003c71b86657822edf9c651bda972c311c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=dave+ramsey+baby+steps+printable+pdf, which is likely used for phishing or to serve a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/strik?utm_term=dave+ramsey+baby+steps+printable+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461485/normal_60126b0188d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_601b14ae8e857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_60520320f088a.pdfIn PDF document text
    • http://oneshops.space/seagate_backup_plus_portable_drive_model_srd00f17vlk8.pdfIn PDF document text
    • http://rasprodavaika.ru/9916606366w4j8c.pdfIn PDF document text
    • http://powerpoint4you.ru/91119439724w87rb.pdfIn PDF document text
    • http://vsedlyatebya.xyz/whirlpool_thin_twin_where_to_put_detergent5hlra.pdfIn PDF document text
    • http://rameautbxy.space/mejudamekajorifafalfz3th.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://uploads.strikinglycdn.com/files/f7fde279-6207-452a-80f4-f5c61b46471f/char_broil_tru_infrared_electric_grill_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f644a63-9846-40c3-8c04-768275fff949/vuxizujalelegowemaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489e8f60-4266-434f-baca-384aa15d366b/39105131557.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_e047ee94f1054a4fafa7bbd2c8811f46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f596da-fa46-4e2e-997c-dee4e78d1e5a/honda_es6500_generator_not_charging_battery.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_e567e445272d40cab756755b499979e5.pdf?index=trueIn PDF document text
    • http://fitubupit.epizy.com/jibajolivikowugupojopum.pdfIn PDF document text
    • http://gadivedu.rf.gd/99081404825.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_a60715000c5f49039c3f6c5517922f7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f7203a-d741-4500-a473-89e9cce030ea/baby_trend_expedition_jogger_stroller_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa98e0b-84bc-40eb-922b-ee687ac1501c/what_does_abigail_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64548814-fd67-4d52-8995-9667ccd1972f/vufagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0ded67-4da4-4bb1-910b-d81fee7a0c1b/where_is_the_learn_button_on_liftmaster_logic_5.0.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_fd1d3a6d5a604344a02cff0726144d53.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 5168 bytes
SHA-256: 2d967f7bafaad1071677912b3836543e8ae5d9a2e2d7c5299681663221e4984e
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10880 bytes
SHA-256: b8e2d7108a9b9db0dd93f9ec90a991bf0c7a45e1d572ca7ac17f9f285963db49
font_03_sfnt_off000143dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2