Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef8f85fe20b5896…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 00:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d8aa4be93d0d434c448410089999945e SHA-1: d888b17de87812d60bab2713e399d38cc8616387 SHA-256: aef8f85fe20b5896c72646a79b2b45b275c4059d47099b55fbd7f49759d20473
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://baarspo.ru/strik?utm_term=free+menu+math+worksheets+pdf PDF link annotation
    • http://pezafuvux.iblogger.org/54839594409.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/giifagt/green_pepper_nutrition_1_4_cup.pdfIn PDF document text
    • https://cdn.sqhk.co/govibabika/gfhiVRd/kirikino.pdfIn PDF document text
    • http://erogan-oficial.site/samsung_whistle_sound_ringtonewui2g.pdfIn PDF document text
    • http://kepidurenomabo.22web.org/census_report_2020_kerala.pdfIn PDF document text
    • http://nemekarasika.iblogger.org/rovuxugikidurimivuxe.pdfIn PDF document text
    • http://popijizixoxovoj.iblogger.org/83593758355.pdfIn PDF document text
    • http://fullcreditreport.info/writing_sample_for_college_admissionxgjps.pdfIn PDF document text
    • http://student-yurist.ru/non_linear_storytelling_meaningk03e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panabodu.rf.gd/quick_icebreakers_for_virtual_meetings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aac5d31-8060-437b-866c-a324732cda72/mamiya_rz67_pro_ii_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40335082-85b5-42c8-8c3a-79475a6c9ed2/51595423082.pdfIn PDF document text
    • http://vikigadawemak.rf.gd/app_para_aprender_ingles_nios_10_aos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2231dfa-15ac-42b0-82f3-aabde595409a/96215077249.pdfIn PDF document text
    • http://lenawukefiraba.rf.gd/24948346286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5f68a7-6454-4dd2-bfee-69a2579a42d7/zepoz.pdfIn PDF document text
    • http://tanasebebibe.epizy.com/46385454884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11b8295-0750-47a1-8e37-bb9628a4b69d/how_to_use_a_bunn_vpr_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62986522-d335-4f2a-a8a5-37200f7eeefb/69782702711.pdfIn PDF document text
    • http://xubumanazi.rf.gd/solid_state_physics_ashcroft_mermin_solution_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515edb1d-8afc-48c6-af2e-c07eaa37ae66/53836299291.pdfIn PDF document text
    • http://taxupot.rf.gd/50599442305.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 5360 bytes
SHA-256: 00a9e04e46a615c749697c3d2a095158b0782a53dc23c7cbc26d43a45548642f
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 10900 bytes
SHA-256: 6a2b3b943694855a7e784648a381974ffd8e9c2ad2cd9d585bd6cc64c23e2efb

Open this report in the interactive analyzer, or submit your own file for analysis.