Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b59a88db4732f1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 02:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d1af5e8f938f7f232944d9ab2faeb1c SHA-1: 81311737f6757d0862d29e02a5ce228053c9da1c SHA-256: 70b59a88db4732f17923e3227db3db15c655d01ec3e109093881216fcd85db4b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many associated with link farms and disposable hosting, suggests a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly indicates the document is designed to trick users into believing they need a password to access an archive, a common social engineering tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=aplicacion+para+desinstalar+aplicaciones+android
    • https://habibitours.net/ckfinder/userfiles/files/16332189006.pdf
    • http://geometracosentino.com/userfiles/files/39272933183.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/58040230103.pdf
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/wuxozezejalujon.pdf
    • http://someteme.com/archivos/_20210907033136.pdf
    • http://eros-arena.de/eros/userfiles/file/ziregejikaxelilur.pdf
    • https://triyoga-tv.ru/userfiles/file/23959783810.pdf
    • https://zaragozadenoche.es/upload/files/guzakemepezazujupap.pdf
    • https://umartravel.com/files/jotizavude.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/93845140054.pdf
    • http://ekmeta.lt/failai/file/90800321280.pdf
    • https://virtrade.gr/userfiles_lybo/file/nodaletexes.pdf
    • https://mavachhaiphong.com/upload/files/91920255338.pdf
    • https://mimpishio2bet.com/contents/files/25967437777.pdf
    • http://oldmotorsclub.com/files/file/10759172468.pdf
    • https://phr4u.com/files/ruvigepujedi.pdf
    • http://giasudaihocsupham.com/Images_upload/files/sazuxawipubaxadotenuzu.pdf
    • https://ceccarbotosani.ro/userfiles/file/97563483231.pdf
    • http://kieryk.pl/img/userfiles/file/74761277848.pdf
    • https://macroedunet.com/userfiles/file/tolobadavajosuziw.pdf
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/vipamitimegi.pdf
    • https://seo-methodes.com/userfiles/file/68261960548.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/s78ab42pilksr0oh3fkcjjpj14/40539759619.pdf
    • https://mangallagn.com/images/file/fojazumomaxoz.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/51731610580.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_off0000c191.bin
807ac7f0495cb3d0f9e47229cdde380f3ba6809c4b4b80bdd4f242daa6c065ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 10488 bytes
font_01_sfnt_off0000d98e.bin
02f15a8899b1d9ea9276d7999e501c6fc019b920a44a4cfa424c03fdc0d29661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 16600 bytes
font_02_sfnt_off000102fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16792 bytes

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