Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04071e03ac3a6f8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-22 16:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e457be78988e5e5d130105a1c180778a SHA-1: 05ec9d0f1b09b7fadaa0537b3829b19f301ff03c SHA-256: d04071e03ac3a6f873ccf4d8344e97f5dab1bc7348bfd2356a598dbfbaf041e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, pointing to a malicious PDF. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.chatanakonci.cz/userfiles/file/paxitejoxadimiw.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/vimam.pdfIn PDF document text
    • http://agilesolutions.in/uploads/sixejirematewupaz.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jofepofowiwidalavowufo.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tuzejazorifud.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bimipejuvap.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143d17f9ee2e---66744753181.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/64271192159.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/tisal.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/95519293580.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/17204351138.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/fonazagevipojel.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/68669770224.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/77314141879.pdfIn PDF document text
    • http://deltools.com/userfiles/file/48934847407.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/45729929667.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/ditavudegofos.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/xaxixo.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/62844498481.pdfIn PDF document text
    • http://meta-min.com/files/97654416366.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/46046972241.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/miwudogaxidarowomatine.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/winawevegajatoge.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/65070990976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=phrasal+verbs+with+come+exercises+pdfPDF 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_off0000c93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 11176 bytes
SHA-256: 636ff8fa7b34a6fed0a87427e88a82633ccd48a087f14538fecd05ae9c10ff1e
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 17184 bytes
SHA-256: 537e62af04e13a811a1088feb5b63c36798d8ff19dddfecf68e1375c0ef602c8
font_02_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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