Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d2e1f413469493…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 21:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f3da5fc776dfe6d73bb7e95a6b99800f SHA-1: 0f6059c4c8dcbc16ccbabc5cb5f2dcaaf89f7963 SHA-256: b8d2e1f41346949354de039c111e2abb6c6be2d79d8136b221f7f5cad6adee86
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. Numerous embedded URLs suggest a link farm designed to redirect users to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=android+connect+network+drive PDF link annotation
    • https://maytinhdalat.vn/images/uploads/files/xusuvodewilawumatipimasa.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/79189903933.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/pebixadopepibaxepobe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87d737031f0c9ff4d782eca6b92a742e/95134965781.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/63161013075.pdfIn PDF document text
    • https://masihpt1.com/contents/files/ruxubam.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/43930604464.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/zubolomadali.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/sewit.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/17417001415.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/zilipoxapovunedelakuzika.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/56d118aafff54c49cc5435c48dda0bec/rivoj.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wetuwesabitenapulo.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/59016434394.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/47232181191.pdfIn PDF document text
    • http://saaretravel.ee/images/file/47674590158.pdfIn PDF document text
    • http://tavio.su/files/file/zipapivawamekud.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/95383999763.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/lidazinijusijawili.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/damonisaxapenaxem.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/79419571288.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/votalazakomewovozi.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/kufanevukezopoxiwadoxer.pdfIn PDF document text
    • http://mfahk.com/upload/files/52083557087.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 17408 bytes
SHA-256: cf73532ed57e0f9ed131dd3078c548e9cb9f62ff73f4fb043c570d27c4d97d03
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 10212 bytes
SHA-256: 5f3dfd8e331b809aed894ba6887c7ee02ddfbb26a091bf216f0718e51b198cdf