Malicious PDF — malware analysis report

Static analysis result for SHA-256 184a563eef83da14…

MALICIOUS

PDF

92.1 KB Created: 2021-09-10 13:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4b2ec70fb39961451b0fd98eca6aa119 SHA-1: c9a7700174ea868a9ea99e7e0d1e2dca693d8b66 SHA-256: 184a563eef83da1437067f27f1ca112ef5ea54690d68666741f76a53a3757412
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves instructing the user to interact with the clipboard in a way that facilitates command execution, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://thaimassagemodel.com/ckfinder/userfiles/files/25619691036.pdf In PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/97581369306.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/4418226312.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/43304858627.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/44786375353.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/26085187538.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/nileburafemedufubozoku.pdfIn PDF document text
    • http://hexindechem.com/upload/files/59367436552.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/gazisaxukabanamozam.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/vejoji.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/buzapuna.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/kolejulem.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/84130759810.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/bomekinirad.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/fomokigote.pdfIn PDF document text
    • http://only-svet.ru/upload/files/30145262320.pdfIn PDF document text
    • http://qdjshg.com/files/file/73628957799.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/11973114731.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/fetimegoraf.pdfIn PDF document text
    • http://landpas.pl/upload/file/welenusorajesevasu.pdfIn PDF document text
    • https://bawauang.com/contents/files/74152272139.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/75034750654.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/buzorunisikuxerakidij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+xchange+macPDF link annotation
    • 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://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_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 18644 bytes
SHA-256: 13ac0b0d4b7eaee8de13ddf82eed1834b102281c2ec454aaa9364323bb9538ea
font_01_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 10400 bytes
SHA-256: 9cea3e224b453430ca7f9c87b126089c55fb204e037141f513ea44d8ef5b0d0e
font_02_sfnt_off00014b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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