Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a514b1334b959a7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 03:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c6d6431ea102845b2e999e53a83f93fd SHA-1: ccd632787147387a81e9e04b0fa10e901327c93e SHA-256: 9a514b1334b959a788725a2105725466e63d616d2be3313149139fa0295465b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://krajinar.cz/soubory/files/bulikiwafelizijitagaxu.pdf In PDF document text
    • https://mayersoffice.com/userfiles/file/7845416874.pdfIn PDF document text
    • http://superpart.com/files/xonunovofamugikiwisixodu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/29274645810.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/disoda.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/49750849290.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/jisuzu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/xuxasedobizifamuna.pdfIn PDF document text
    • https://digireg.ch/upload/32216501205.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/92088968225.pdfIn PDF document text
    • http://stefani.cz/fck/file/911933979.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf71be65---44859533405.pdfIn PDF document text
    • https://bdata.vn/upload/files/85766549760.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/8550777497.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/vusesosa.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/26965718547.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/33296847857.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/gixajifamogotafuxizapev.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/binajoganukafaj.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/rafazeveguwisokifo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109081008038116.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/64431757711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=shadow+fight+3+androidPDF 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_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 10620 bytes
SHA-256: 752eae77a63174220ba8ac197f90cac56ec08188d84304d29daabf5153b4d7f1
font_01_sfnt_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16448 bytes
SHA-256: 66500f3a4ca9e677dc41d02a766b558524af0dad0e35d885cd0a29aee3766059