Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed5984c7682c45e…

MALICIOUS

PDF

42.0 KB Created: 2020-03-22 14:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7dfa01c41416db072d8730db408e40a SHA-1: 1f5b7162f46365587e31cd2f3f8450d33a600a85 SHA-256: 1ed5984c7682c45eb06f46b5ed1015dfd8bb434d21152d418fe63ddec3e143be
94 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious payloads. The document body itself is largely unreadable binary data, but the presence of numerous URLs pointing to other PDF files suggests a link farm or distribution mechanism.

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://tmceban.com/uploads/1/3/0/6/130604536/130604536.html#nombre+de+estrofas+segun+la+cantidad+de+versos
    • http://drivebeehive.com/uploads/1/3/0/8/130874042/mufenip-vugogoxumidade.pdf
    • http://michelamclaurin.com/uploads/1/3/0/8/130874272/xujuzemimuxowipoz.pdf
    • http://ericfellow.com/uploads/1/3/0/2/130272280/gogavedoturezo.pdf
    • http://asiasoft.com.sg/uploads/1/3/0/5/130539336/6462807.pdf
    • http://www.youcanbepregnant.com/uploads/1/3/0/6/130603943/54ae880.pdf
    • http://www.amazonverkaufsmaschine.com/uploads/1/3/0/7/130738940/1428395.pdf
    • http://wealthwavedallas.com/uploads/1/3/0/3/130312924/tojatulovinatu.pdf
    • http://krackerjackskennel.com/uploads/1/3/0/5/130590019/bulabino_febedo_nukubufem.pdf
    • http://krishannathan.com/uploads/1/3/0/3/130323767/8a02af7a.pdf
    • http://elizabethjin.com/uploads/1/3/0/3/130313027/1380114.pdf
    • http://www.mrulmersmathunit.com/uploads/1/3/0/6/130621664/68fd239e.pdf
    • http://visualizarmasarquitectura.com/uploads/1/3/0/6/130621303/negepal.pdf
    • http://moporter1013marykay.com/uploads/1/3/0/6/130603676/3447728.pdf
    • http://purdytan.com/uploads/1/3/0/5/130551226/8996389.pdf
    • http://deejung.net/uploads/1/3/0/5/130551581/3284755.pdf
    • http://flowm.io/uploads/1/3/0/2/130287313/kaguvovibos.pdf
    • http://100alicestories.org/uploads/1/3/0/6/130639647/sumetisaxuv-sanul-jarakofe-loreguxim.pdf
    • http://beeftera.com/uploads/1/3/0/8/130813650/towerununu_saregevigoni_zediwaz.pdf
    • http://mymcaroadsideassist.com/uploads/1/3/1/0/131071231/milesafen.pdf
    • http://www.belindako.com/uploads/1/3/0/7/130739986/603009.pdf
    • http://merkabawellness.com/uploads/1/3/0/7/130775665/d2e24e2cd80.pdf
    • http://nandamay.com/uploads/1/3/0/7/130738929/ca6f2fdf8d5a.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000780f.bin
e9d31d97a957d08d667de8c66eeaba7eb5d21010d00562f85b5ef40c086ce61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 8828 bytes

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