Malicious PDF — malware analysis report

Static analysis result for SHA-256 49045771274c6317…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 15:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a336f6e83ef19d74db58332a966ab157 SHA-1: f2548434f425cb71a2726e8912cc6b183a965b95 SHA-256: 49045771274c63175dc8002b1e70952c0c54ef7317860c1ec217309830c85188
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for 'Clipboard command execution lure' indicates the document instructs users to copy/paste content into a shell. This strongly suggests an attempt to execute a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://smidgel.ru/uplcv?utm_term=android+system+directory PDF link annotation
    • https://btsis.com/upload/ckfinder/files/37573363879.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/28265001000.pdfIn PDF document text
    • https://turbooto.vn/upload/files/94028342899.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/dusazebomulumodemenam.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/vuzebebodo.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/3864179949.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/67340357107.pdfIn PDF document text
    • http://seamacros.com/upload/file/dataw.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/30324204537.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/84377074238.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///36570876526.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/53962131439.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/83263392999.pdfIn PDF document text
    • http://airzo.net/userData/board/file/xojoregevoj.pdfIn PDF document text
    • https://nada70.org/userfiles/file/fulenegumefesakosirepoda.pdfIn PDF document text
    • https://777mto.org/contents/files/pefaxowetakiliwosaxu.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/vivularazifamamezuvifad.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/60311731928.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jbgp8frl4sgeds1g0o98g2m6l0/kixujijarovan.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rimujanubasunafoterejagix.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/jukibalogapudepi.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/70739399597.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/41119050803.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/89292473906.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://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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 10420 bytes
SHA-256: 32f0512348170864858cd6dac227df5269c1a66e668331cf3aea11b4dd3174a9
font_02_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 18248 bytes
SHA-256: 2058af947882ac14b2c98b27a4dc6262d96377705647d5ca852b02a365907764

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