Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c882d36582e9b9c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 12:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fc02c910179c3472face579f63129c4 SHA-1: 50b424864852ac8f36a431b619a25942e4810e34 SHA-256: 9c882d36582e9b9cb81a2a8884faf4d458df0f3e3dd99a4ab99c37205ad1ae3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links, including one with a 'pc apk download windows 7' UTM term, suggests a lure for downloading potentially malicious software. The document also contains visual cues like a download button, reinforcing the deceptive nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=pc+apk+download+windows+7 PDF link annotation
    • https://legyenegyjonapod.hu/userfiles/files/rakarira.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/86313319125.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/47574546164.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/57876147357.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/xaluxefowimi.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/36993785300.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/94591375410.pdfIn PDF document text
    • http://juha.be/_files/file/49622734128.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/samubilula.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1674449437613c66e8e8187.pdfIn PDF document text
    • https://loyd.rs/images/file/86848493826.pdfIn PDF document text
    • http://chinazzjx.com/d/files/jusukefevowab.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/73914082350.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gasavebogatowolujopudeze.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/5527638361.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/29605321844.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/4749201152.pdfIn PDF document text
    • http://horvathortho.hu/tmp/norito.pdfIn PDF document text
    • https://cowik.pl/upload/97292292968.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pekonuxikoluxilu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/46960487075.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/21448972775.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/42743417008.pdfIn PDF document text
    • https://12tiga.com/contents/files/videtazoxurel.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/badinafusapozopugujodebu.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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10404 bytes
SHA-256: 7bacde483cd520b10247d5f048fdfb9beadf5d810875b9ba7c1ac64e57ff13a0
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 18396 bytes
SHA-256: 5cd22b3b2c57947e262fb7d94da5cd15ea792198c15d153d1513f5bd1ecbda0f