Malicious PDF — malware analysis report

Static analysis result for SHA-256 4632de9f4f6321ae…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 17:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2156468ef0f349b3a5aa42ade4ef4d48 SHA-1: 24cfcbb6d082f6293b055e3d12a0650249cf157a SHA-256: 4632de9f4f6321ae00d168ce292f23b63179343ed955414caf6c368aa4b04860
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent to redirect the user to potentially harmful content. The heuristic 'SE_SECRET_RECOVERY_LURE' suggests the document may attempt to trick users into revealing sensitive information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=download+apk+gallery PDF link annotation
    • https://mayxaydungthienlong.com/uploads/files/files/40540085426.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bc2c4012---47109702225.pdfPDF link annotation
    • http://designpavelzapletal.cz/files/file/ninotumidi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8cac4253e80823538614bcd38aa3a648/xexutugibutuxasanod.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/makonofeni.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/37158482550.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/78335846157.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/78255219226.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/32898998622.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/82234431561.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zomagefejoso.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/76006608696.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/nojeligodopewovotinawuxu.pdfIn PDF document text
    • http://szhlfz.net/upload/72170120744.pdfIn PDF document text
    • http://farmina.ru/uploads/files/53373310380.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/3448384229.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wifalemanesujuwuvej.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/43215547263.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/59357085708.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wojawogifelozowekud.pdfIn PDF document text
    • https://samudra99.com/contents/files/26228522839.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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 10500 bytes
SHA-256: 8aba632bf4360af4033b3a9fda2af94ae346684336643890ba6725815addd266
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 18808 bytes
SHA-256: 5b51adaefb843f187b9eab82d1331198cb7f35d8a049442ff3f9931fc5d5870c