Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6866ff12f7b71a…

MALICIOUS

PDF

53.0 KB Created: 2020-03-13 01:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0dc80199e3b20c8483a52637e644d076 SHA-1: a8f9b679cd0b29b4b7e5f256c2b110196509c019 SHA-256: bc6866ff12f7b71a92d8e6f730c86e520a248b39cf33656df37b15e44d2765d2
94 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs. The primary attack pattern appears to be SEO poisoning or a link farm designed to redirect users to potentially malicious content hosted on numerous subdomains.

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://74-123-79-26.mgwnet.com/uploads/1/3/0/5/130539492/130539492.html#cause+and+effect+of+bullying+essay+pdf
    • http://isabelleding.com/uploads/1/3/0/4/130476468/bivisanem.pdf
    • http://mail.snackaddictedhi.com/uploads/1/3/0/2/130288642/jakusikimudipe-bumitupadikane-vudozejajapov-gizigaferego.pdf
    • http://yvonnejonespaintings.com/uploads/1/3/0/8/130813453/2225171.pdf
    • http://rostelekomrt.host/uploads/1/3/0/6/130620926/6308127.pdf
    • http://www.triadinsight2020.com/uploads/1/3/0/9/130969184/napuwumifofu.pdf
    • http://287ranchsupplyboutique.com/uploads/1/3/0/5/130589195/zujiwazokawa.pdf
    • http://lightwavewellness.com/uploads/1/3/0/5/130590059/7236330.pdf
    • http://sarahholt.net/uploads/1/3/0/4/130483153/5539260.pdf
    • http://gamenightgroup.com/uploads/1/3/0/5/130544591/davos_zabunex_tipan.pdf
    • http://barkhousegrooming.ca/uploads/1/3/0/4/130488503/5313725.pdf
    • http://preeminenthcltd.com/uploads/1/3/0/6/130621700/c33dec8d18d1a.pdf
    • http://localwebsite.design/uploads/1/3/0/4/130476332/luseruwej_nawoguxu.pdf
    • http://medicinereturn.net/uploads/1/3/0/5/130589427/0cf82331a2b2271.pdf
    • http://superioradultdaycare.com/uploads/1/3/0/7/130775923/72dd8d12.pdf
    • http://digitalsqueak.com/uploads/1/3/0/7/130738739/folakugo.pdf
    • http://microtex.limited/uploads/1/3/0/2/130274267/gemulokerubu.pdf
    • http://999-podarok.site/uploads/1/3/0/5/130539215/nofuteguruselep.pdf
    • http://www.magalidelarosa.net/uploads/1/3/0/2/130270974/5740866.pdf
    • http://ndlobmac.com/uploads/1/3/0/6/130620677/zufesugederip-falalulosumofot-bujof.pdf
    • http://buyan-group.com/uploads/1/3/0/9/130969798/jonuwugif_takiwalonibuti.pdf
    • http://mta-sts.dmcappraisals.com/uploads/1/3/0/7/130776022/sulokipelezufoguxix.pdf
    • http://www.1880pizzapastahouse.com/uploads/1/3/0/2/130289558/jifixa_falixufuwubolet.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
font_00_sfnt_off000083d3.bin
03f6a580a2318949add58b119b69744f91ad93577d3825805ff6c67bd6f8528a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D3 8272 bytes
font_01_sfnt_off0000a395.bin
78ffaaae48d01fb879ab8339076c14d750641de80160eb14430198008da9c7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA395 4112 bytes
font_02_sfnt_off0000b077.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 16092 bytes

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