Malicious PDF — malware analysis report

Static analysis result for SHA-256 83537ee5ae5963e3…

MALICIOUS

PDF

75.9 KB Created: 2021-04-08 22:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 746416c54c262c155284c276201b3f95 SHA-1: 265e57dbb0537b844682207fad8879ef267a665a SHA-256: 83537ee5ae5963e3f1d23ad59b918d2e75e6d04185c23eab4cf0ad77211d4a38
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lozipotod.ru/strik?utm_term=how+many+ar+points+is+the+chronicles+of+narnia PDF link annotation
    • http://kismyketio.com/30651715216l8yau.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_605dcd3e57b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459630/normal_5fdb3827453bd.pdfIn PDF document text
    • http://item-mask.top/tuvelovogipexj8h6k.pdfIn PDF document text
    • http://springwin.space/durban_weather_report_for_this_week6q9ii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_600d40f9a9dad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibodox.rf.gd/binder_oven_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5688092c-fc1a-4890-854f-e6262ca57632/rutugariwozekezaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c06fbe-2b9e-42a7-aa3c-1e5e71b2ff66/87028792080.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/introduction_for_gram_staining_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/scb_set50_fund_fact_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352978ce-57f4-4024-9f9d-379b10fa8e9c/what_is_structure_in_healthcare.pdfIn PDF document text
    • http://sitiwaruto.rf.gd/dodizakuvuzezipumo.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/apkpure_pc_version_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/du_university_b._ed_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534e0751-66f5-4560-9fe4-1fa1a0987426/15516971534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eadf12d3-ccb1-40ea-9767-344a82525b3b/endurance_training_exercises_with_weights.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/black_screen_lyrics_video_layer.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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 5408 bytes
SHA-256: de5816328aed7df4e269e327736ed361a9cc2cd9806eb8f10366c1f53da59a24
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 10576 bytes
SHA-256: 9a1a24fa7939c86a8322ffa1010c75288c4bfcf3a9b5e75beffd285b598c9693

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