Malicious PDF — malware analysis report

Static analysis result for SHA-256 8531946bb4d65c9c…

MALICIOUS

PDF

49.2 KB Created: 2020-04-04 06:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19a8ae3251f4c31f5a6a513b6a41d7f2 SHA-1: 493a90df63bc3154582aa6bfca60dca8ff184ff5 SHA-256: 8531946bb4d65c9c02574f9693f5012e4aab4ea37b8ca10367c26391c6e2486a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to host malicious content. The document body, though heavily obfuscated, contains a URL that suggests a lure for downloading software, likely a pirated version. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm and a download lure indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 http://joncloudinc.com/uploads/1/3/0/6/130620603/130620603.html#lightroom+5+serial+number+free
    • http://breenbooks.com/uploads/1/3/0/6/130640236/dd8187f13301.pdf
    • http://voteshayne.com/uploads/1/3/1/4/131438137/2198699.pdf
    • http://americanlegioncleveland.org/uploads/1/3/1/3/131383416/500503.pdf
    • http://sitarevoyance.com/uploads/1/3/0/7/130738762/vajinedodekewizuzi.pdf
    • http://patrollocker.com/uploads/1/3/0/3/130312971/xuwafexogaxe-pekuvubej-bobobetoma-totegelaxojubuf.pdf
    • http://crystalsea.co/uploads/1/3/0/8/130874434/9359366.pdf
    • http://mindiskitchen.com/uploads/1/3/0/3/130323656/towebomawugi-jezezuxetisisa-wavosi-xemozerodejomur.pdf
    • http://fortyshadesofpleasure.net/uploads/1/3/0/6/130639027/pobev_dubazegatofu_gagaxebele_xomerebin.pdf
    • http://yokomi6.com/uploads/1/3/0/5/130590403/bevizuzitefedimif.pdf
    • http://www.thehairgalleryia.com/uploads/1/3/0/3/130323229/kupizo.pdf
    • http://ablelawnandtreecare.com/uploads/1/3/0/5/130551073/1593132.pdf
    • http://hotmixmarketing.com/uploads/1/3/0/5/130588783/37a1cb.pdf
    • http://kembyshiroshima.com/uploads/1/3/0/6/130603858/fagukuzofaw.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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • 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_off000074b1.bin
896c4f75f5d0053854c7d4f5c5642e3f08b9609917abdbf99c35999036bfbcc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B1 8528 bytes
font_01_sfnt_off00009547.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9547 4144 bytes
font_02_sfnt_off0000a23d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA23D 16036 bytes

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