Malicious PDF — malware analysis report

Static analysis result for SHA-256 309faaefe8790618…

MALICIOUS

PDF

116.9 KB Created: 2021-04-30 09:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6fa7dfad855bd6af4c5304698f9099da SHA-1: 5520eca5db57cf3c3b75f0e29a5a34e2d50d3249 SHA-256: 309faaefe87906184f6afcce6f92342667cda67d4307fa1c06bb7e78fd5cc401
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://jacksth.ru/strik?utm_term=socratic+questioning+for+depression PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5fc60356cfff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fda7e7a83b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_6068b122b194f.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/djcY50Q/50696269921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_5ff4c932a2362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fdc35320eeb4.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/iSifcib/86634547483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_600f26435668c.pdfIn PDF document text
    • http://femalukus.iblogger.org/sitizasonavujunix.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/jfhfCPd/5519739205.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/jdYvhgu/asana_login_qeydiyyat.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/hollow_wooden_surfboard_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5ff4c38dd150f.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/8347918019.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/4b23c741-1e91-42b1-bd0a-2bb0f91392f1/python_remote_car_starter_instructions_for_reset.pdfIn PDF document text
    • http://zujakogi.onlinewebshop.net/fadatubesojax.pdfIn PDF document text
    • http://xevivalekivo.epizy.com/mugikufawakasilaxojelipa.pdfIn PDF document text
    • http://siwojab.epizy.com/biological_molecules_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ef6f03-8749-4116-adce-d2773760fbba/how_to_do_sales_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0bf6f3-37a1-4a3d-a539-10d135ff0be4/77274995229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df360222-247b-490d-a922-c9f10ac1b514/south_carolina_drivers_manual_audiobook.pdfIn PDF document text
    • http://wazinupizut.epizy.com/activesheet_range_select.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/memudigonive.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_off00018d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D4D 5520 bytes
SHA-256: 0164eee44982274022a6475e88f5fdda4859cc64204b30f5ffe60ce9137b3522
font_01_sfnt_off0001a01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A01E 11148 bytes
SHA-256: 82aee4c87106da57e312bb5401b776e7cd51b2520403a6ae27af5a061ec16763

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