Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa27655e274d7107…

MALICIOUS

PDF

87.8 KB Created: 2021-04-12 21:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f9e74bc9182ec0c62ef4fefd50e903c8 SHA-1: 7e38c4e10acc9e9e8d02f6b11f599c28ca872cf1 SHA-256: aa27655e274d710759d41e8f7c28fa18aae3763159d568cdcbd5a285cce840f4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+to+do+image+processing PDF link annotation
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/3c1aac2d02c.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/cjb3Qja/72926039007.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://amsidgi.xyz/athiran_movie_songs_starmusiqnbrtx.pdfIn PDF document text
    • http://logmeinnow.xyz/7131957687l9ic9.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/abjj1gf/drum_machine_ios_app_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_606b0ef8254ed.pdfIn PDF document text
    • http://lepasipun.iblogger.org/cateye_padrone_user_manual.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/lopemojalogotawexi.pdfIn PDF document text
    • http://xivitej.66ghz.com/what_are_the_3d_commands_in_autocad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491705/normal_601c7c375b38d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_6021c14fe8be2.pdfIn PDF document text
    • http://akfb.online/dupakaludesekukinuxinc6msk.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/archimedes_palimpsest.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/when_did_bc_and_ad_become_bce_and_ce.pdfIn PDF document text
    • https://wewofubajibopa.weebly.com/uploads/1/3/1/3/131381003/7780700.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/jbhjS5W/cell_phone_number_prefixes_philippines_2019.pdfIn PDF document text
    • http://bevibopo.22web.org/14018055038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://motirovaribepok.rf.gd/tewalatidibebesokadabiz.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/graph_paper_a4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 5412 bytes
SHA-256: 39cb4b40da35b92b27dee6d851bf1f133870a3bc3679b570613cae882e61c78b
font_01_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 11476 bytes
SHA-256: a2b664e5a3434f25846a66b43d9a75c60695091d1c890ec1d984b1cf5b86014f
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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