Malicious PDF — malware analysis report

Static analysis result for SHA-256 f661326ef10a4f99…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 14:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf20b63d6a0e2e8b44b275226919c953 SHA-1: 70fb442a19d14df9de3d308e15a95204257b220f SHA-256: f661326ef10a4f99a05bf466b5b9cef78a4df4b264eba80bf5250d4ab962b614
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores

This PDF document exhibits multiple indicators of malicious intent, including ML classification, ClamAV detection, and heuristics related to password recovery lures and link farms. The presence of numerous external URLs, particularly one with a 'utm_term=export_passwords' parameter, strongly suggests a phishing or credential harvesting attempt. The document's structure and heuristics indicate it's designed to deceive users into divulging sensitive information, likely to facilitate account takeover or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=export+passwords+from+chrome+to+safari PDF link annotation
    • http://gardenofsound.com/userfiles/files/tizejabisixabo.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/boxurepojanaxone.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/pitutafonujalogo.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/50789296008.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76076006750.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912045949676653.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/100734305.pdfIn PDF document text
    • http://chengzechem.com/upload/files/kefaguratilurirulunanol.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/73200547586.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/zetixodugubozejokiduv.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210908071319.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/73319314426.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/52557121153.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/33252984173.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210912164836.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/xitevatefewu.pdfIn PDF document text
    • https://stopserv.ru/files/file/51683769895.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sidufimafisadukafivuzurig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f601b8cef---linigururute.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58795340689.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/61559890256.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210909011106270.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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 10908 bytes
SHA-256: 43257fa505eb02c5ae4b30eb90df562ec3cfad3666126c90b5abfe169c4c6888
font_01_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 19792 bytes
SHA-256: a905cd2b195ac8c7bdaa9805e900ae6466e9d5b99852251dea4fb33fd4638b62