Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6d7b629fcbbf61…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 21:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b88a8f8b1c2607bd735485738874a6d2 SHA-1: feade2704062dd9e54cdb7062058c72e46fbb5b5 SHA-256: fd6d7b629fcbbf61bc7eb9de756451388e28a936ebc8c991b48e09329cb88e58
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing campaign. ClamAV and ML classifiers confirm the malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://apsara.ru/userfiles/file/resuvugoguz.pdf
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/28625162021.pdf
    • http://imhkayseri.com/resimler/files/30273077238.pdf
    • http://glassick.com/userfiles/file/lewivan.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/susarilojirumud.pdf
    • http://nissanotogovap.com/uploads/images/files/sapipudinonupukebox.pdf
    • http://anpharma.net/upload/files/taxanerogiz.pdf
    • http://gmkms.net/upfile_editor/2021/files/gamodoberofa.pdf
    • http://wirheiraten.de/images/file/41503709584.pdf
    • http://dainichiji.com/upload_ckr/files/23376408931.pdf
    • http://beiwendq.com/userfiles/file/mebinanojilex.pdf
    • http://rustproofingottawa.com/userfiles/file/54622110982.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/94823832542.pdf
    • http://htygroup.com/upload/files/dozuzimudugu.pdf
    • https://www.idd.no/ckfinder/userfiles/files/9161565886.pdf
    • http://uktohabbarijamalta.com/files/file/vuzerelinetolo.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/65e3a2f14b01bcf309c393b76ca78d87/sekezova.pdf
    • http://carnow.jp/js/upload/files/malelogativawepimixobikal.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/nidigibawugunuxojusupo.pdf
    • http://artstudiodesign.it/userfiles/files/93375220569.pdf
    • http://paliukenas.lt/i/File/wivopigaj.pdf
    • http://sentralperdana.com/file/saradipilugijasegud.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2748c54cf193e747007d7b841c04a4fb/17929691126.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=reading+comprehension+for+pre+intermediate+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 16792 bytes
font_01_sfnt_off0000f4aa.bin
4b0714eb219cee635057ace59d7a33b6f122fa9928635a9e207a14eff3b6d73e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 11068 bytes
font_02_sfnt_off00010dfd.bin
ecc061e29b7ac9eced2a849faf7ede7f462def66e94c90a360fde3329e455291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 16776 bytes

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