Malicious PDF — malware analysis report

Static analysis result for SHA-256 781f3fc0a6695474…

MALICIOUS

PDF

70.5 KB Created: 2020-03-30 02:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 49a05c3646a3397f2a4e379ad4797770 SHA-1: 31504c322b8a4219547692140579a3778abe9fc7 SHA-256: 781f3fc0a66954748823ad2bf385209b3ab1e6b9f81fc7407bda63c2ff0544d3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous URLs suggests a mechanism for redirecting users to potentially harmful content or further stages of an attack. The document body itself is heavily obfuscated and contains what appears to be a garbled title and metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.alchemy-unlimited.com/uploads/1/3/0/2/130287211/130287211.html#comparacion+entre+organismos+autotrofos+y+heterotrofos
    • http://destinbeachphotographer.com/uploads/1/3/0/6/130622093/8e96a21.pdf
    • http://mta-sts.nutec-remodeling.com/uploads/1/3/0/7/130740573/2291034.pdf
    • http://acmdev.net/uploads/1/3/0/8/130813539/8f8ec455eec864.pdf
    • http://rebeccathedoula.com/uploads/1/3/0/8/130813705/xodajikop.pdf
    • http://hostmaster.augmlife.com/uploads/1/3/0/9/130969989/39a8c039a16ac2.pdf
    • http://mountaintopbrands.com/uploads/1/3/0/7/130739173/tokura.pdf
    • http://uwgpl.com/uploads/1/3/0/5/130589098/990799.pdf
    • http://jetgogroundservices.com/uploads/1/3/0/7/130739061/jinarigexox_rogeber_wofurosigozol_dadazenefe.pdf
    • http://newarkfootdoctor.com/uploads/1/3/0/6/130639045/topotugi.pdf
    • http://anyssaochoa.com/uploads/1/3/0/7/130738928/1631378.pdf
    • http://filemakerwebandios.com/uploads/1/3/0/5/130551654/511186.pdf
    • http://ampmdogwalker.com/uploads/1/3/0/4/130435701/waxirewonefi.pdf
    • http://dollarstopparty.com/uploads/1/3/0/6/130604752/b33c26b8b8afd.pdf
    • http://stairliftsonsale.com/uploads/1/3/0/8/130874455/084053a6.pdf
    • http://menfixed.com/uploads/1/3/0/7/130776266/dujijaponizo_fevawoporuxal_dagatab_zojulul.pdf
    • http://stevenamiller.com/uploads/1/3/0/7/130739343/08b698.pdf
    • http://metadata.ventures/uploads/1/3/0/7/130738790/xopogen.pdf
    • http://koastalcompany.com/uploads/1/3/0/2/130273748/628002.pdf
    • http://balipacific.org/uploads/1/3/0/2/130289204/61bced5a84.pdf
    • http://actualityholdings.com/uploads/1/3/0/5/130545895/5725951.pdf
    • http://jacksonforgeorgia.com/uploads/1/3/0/8/130814004/golesofibadabapoxati.pdf
    • http://haleyshaferpeace.com/uploads/1/3/0/3/130323255/7019329.pdf
    • http://ekcoelearningcommons.com/uploads/1/3/0/3/130323174/pifufexixabusi.pdf
    • http://dennismodafferi.com/uploads/1/3/0/6/130639365/jumegorebuxive_zagox_pusagawewod_xozogob.pdf
    • http://haircreationsbyjay.com/uploads/1/3/0/7/130776148/17a53a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ef.bin
4145b76d1fa5a816ae65f5a4aa3f013b613096bfeb92115704705c534df846d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 9976 bytes
font_01_sfnt_off0000f431.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16036 bytes

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