Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa646127a101efe…

MALICIOUS

PDF

87.3 KB Created: 2021-03-11 23:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d8205975a9d5f32be958e16c65e75b5c SHA-1: d064c4b6cd6a3ac946f6db1361a530e2d0508e42 SHA-256: 2aa646127a101efe35aad9dc988a91327c7f82da0ab5e42d1727913f068c466b
226 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of 'curl watch repairs sydney' in the document body and heuristics related to LOLBin usage suggests an attempt to disguise malicious activity or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/wb?keyword=rip%20curl%20watch%20repairs%20sydney PDF link annotation
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/a451733a830af.pdfIn PDF document text
    • http://shoppingyxplus.xyz/undiscovered_worlds_with_steve_backshall_episode_guides8yst.pdfIn PDF document text
    • http://3gusevshop.website/414599719466erbr.pdfIn PDF document text
    • http://zimipodetasasa.iblogger.org/production_technician_job_description.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/desinfeccion_de_frutas_y_verdurasor0cu.pdfIn PDF document text
    • http://dutov.org/sad_ringtone_only_music_tone_downloadzqqka.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/360dc.pdfIn PDF document text
    • http://osummer.space/dogolajed9nyok.pdfIn PDF document text
    • http://kpovli.ru/33257472789932af.pdfIn PDF document text
    • http://raftgjgr.space/pajekibimezibokireaebnq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawojemi.epizy.com/92780140141.pdfIn macro / runtime command snippet
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_f613dd947da2454aad7f4ca973d58ea3.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_26e27b1199dc4438aacc4defe57a0b05.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_3ceb2cc794334fa5942dd7093e99c31a.pdf?index=trueIn PDF document text
    • http://sorajapiliwixod.rf.gd/posekubazowebux.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_99672d0361c2414a8eb1cec4d015f323.pdf?index=trueIn PDF document text
    • http://todabopojexojad.epizy.com/47244212234.pdfIn PDF document text
    • http://zefudisese.rf.gd/77679218377.pdfIn PDF document text
    • http://kojeziponoduv.epizy.com/8341673674.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_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 5364 bytes
SHA-256: 0d403fbcc60aab7a4c4643d83f0da87b0a4d63882f237a1d392f8b577173f7be
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 11584 bytes
SHA-256: cb3d088b162451bc87e2f91b956d9198e8f85f4f97568f290ba3cedafc1815ca
font_02_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 16192 bytes
SHA-256: 782e38977b7d7b48822e4e80b1c2a4f5990fa8b32ca6fb88e147c181cf684755