Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fb27691e19a894…

MALICIOUS

PDF

55.8 KB Created: 2020-03-21 12:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c832faa592ea8592f92574a0983f6541 SHA-1: d59cf90249d6c9534a1a7e2d14bda8cf0b836a95 SHA-256: f4fb27691e19a894ded98b362989a30e4c018b605ac1a3c036b643774ef8fe9b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links and the ML detection point towards a malicious intent, possibly to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://joshleephotojournalist.org/uploads/1/3/0/5/130542972/130542972.html#como+hacer+dibujos+con+marcadores+sharpie
    • http://tatuapparel.com/uploads/1/3/0/5/130551342/fabopalizegezozokaz.pdf
    • http://dentureprofessionals.net/uploads/1/3/0/2/130272644/kabod_xajarufek_manumufin_vaperoguserono.pdf
    • http://livinglegendary.org/uploads/1/3/0/4/130488500/6730330.pdf
    • http://tomcookephotography.com/uploads/1/3/0/6/130603782/pevoteziboger-sagalefoseliriw-xejamurixip.pdf
    • http://kn.eliteedu.org/uploads/1/3/0/5/130544547/roxoropito.pdf
    • http://chat-dot-sparkle.com/uploads/1/3/0/6/130603859/ralixataxojiru_tawuni.pdf
    • http://boxedwine.com/uploads/1/3/0/5/130543373/939e14ba4115.pdf
    • http://mobotflexi.com/uploads/1/3/0/4/130483537/2330180.pdf
    • http://annieweisstherapy.com/uploads/1/3/0/5/130588459/tibedixekatovi.pdf
    • http://bobbiholyoak.com/uploads/1/3/0/3/130313588/wagip.pdf
    • http://sacredselfempowerment.com/uploads/1/3/0/6/130621477/valegoravivuxas.pdf
    • http://www.harmonieconcertband.com/uploads/1/3/0/8/130813577/xomitoxowuxi.pdf
    • http://omgradine.com/uploads/1/3/0/5/130588687/63b2a23fbd72571.pdf
    • http://mail.portsmouthlifeguards.org/uploads/1/3/0/7/130740078/5137228.pdf
    • http://asrmt.com/uploads/1/3/0/4/130476427/55138eaab9476e.pdf
    • http://ardentbliss.com/uploads/1/3/0/5/130588270/4bacdb62b9cdf87.pdf
    • http://sebzillla.com/uploads/1/3/0/7/130776632/9c540ec905bf.pdf
    • http://ecoblueclean.com/uploads/1/3/0/7/130740055/futapodukaze-badike-lanivirofug-dumaz.pdf
    • http://remotetravels.com/uploads/1/3/0/9/130969681/labaxagupavida.pdf
    • http://www.nobleteknology.com/uploads/1/3/0/6/130639895/3669e1.pdf
    • http://lushbeautynz.co.nz/uploads/1/3/0/4/130489006/1801270.pdf
    • http://wit-jp.benq.com/uploads/1/3/0/6/130621701/4386630.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000b3fe.bin
50e4866fbba39c76f046a02c45db150d606c449f6427aba3f47255ce3be34b8b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB3FE 18252 bytes
font_00_sfnt_off000074e8.bin
c0cc38aca5233abe2421ce55b19686cbf76468e0b9ec587c9545b08f6f70f237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E8 11028 bytes
font_01_sfnt_off00009963.bin
74f7e73f12b24f2b2760860b82014933b240a921a9754acf205ca0f65eb6b8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9963 8124 bytes

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