Malicious PDF — malware analysis report

Static analysis result for SHA-256 b529187162d513f4…

MALICIOUS

PDF

35.1 KB Created: 2020-05-21 18:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1e05deec4c923a4a9d57f8f32e7e08 SHA-1: 93323851fe9e9ac02e5fcbc0aa20f1f83babaa96 SHA-256: b529187162d513f480cb60dd4574ea62fec378de82308dc3e837d2e6086d01c7
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malware or engage in phishing. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://1ym.undesirable.us/uploads/1/3/0/3/130313379/130313379.html#sudoku+gratuit+%25C3%25A0+imprimer+pdf
    • http://edgedesigngroupinc.com/uploads/1/3/1/8/131858530/junizelidesunodokup.pdf
    • http://onelinkresources.com/uploads/1/3/1/1/131163738/aa4213e2.pdf
    • http://russopublicrelations.com/uploads/1/3/0/9/130969871/28fb873348f52c7.pdf
    • http://suzanneandbeatrice.com/uploads/1/3/0/8/130813797/kuwisuritijidug_mejapepop_kanizonaf.pdf
    • http://getbillys.com/uploads/1/3/0/4/130476921/pabij.pdf
    • http://anniemelton.com/uploads/1/3/0/5/130544539/bumabonizijip.pdf
    • http://martoraj.com/uploads/1/3/0/2/130288522/lidusekiwar_wotipepebilij_ninewuru.pdf
    • http://isabelladavidvintage.com/uploads/1/3/1/8/131871726/revepigawezinepas.pdf
    • http://justblogging.net/uploads/1/3/0/8/130873995/wafajisosav_vejegasepuja_barexup.pdf
    • http://blackhawkbiketech.com/uploads/1/3/1/0/131070637/gorakaj.pdf
    • http://mysmelt.com/uploads/1/3/0/7/130740015/lamutipevex-komefogufufog-sukidolito.pdf
    • http://bamboobydesign.com/uploads/1/3/0/4/130477372/kuxifelon_todetuk.pdf
    • http://mspritchett.com/uploads/1/3/0/8/130874157/1947772.pdf
    • http://etf12trade.com/uploads/1/3/0/2/130289690/fikisuwolevav.pdf
    • http://louisvillekyfenceanddeck.com/uploads/1/3/0/7/130739789/6882615.pdf
    • http://wallingfordwood.com/uploads/1/3/1/6/131637773/9753003.pdf
    • http://bigboyvacations.com/uploads/1/3/1/0/131069970/a56f9.pdf
    • http://newriver-yoga.com/uploads/1/3/0/7/130740257/42b818d.pdf
    • http://nohomoprod.com/uploads/1/3/0/3/130379315/e3a086ad94e72.pdf
    • http://rpmosiertherapy.com/uploads/1/3/0/8/130873997/3468081.pdf
    • http://greenvalleyfloral.net/uploads/1/3/0/6/130620581/wetejibebi.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_off00005a95.bin
784e2b3c69ee30295a2e77712ededbf4d0b6ecd811bfa5b72e638a292d863986		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A95 11100 bytes

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