Malicious PDF — malware analysis report

Static analysis result for SHA-256 459e9d632891c076…

MALICIOUS

PDF

44.8 KB Created: 2020-04-23 14:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15c1dca353597313d2cdefb93eaf2f89 SHA-1: 40238db8e113dac6b6b6bbca8895052cc4ab0a2f SHA-256: 459e9d632891c0765ace6eff7f6e8d7ab6deaa476317447b4b21a39c9424efd5
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites. The document body, though partially corrupted, suggests a lure related to 'Grammar tests with answers'. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to distribute malicious content.

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://wordsmith-sg.com/uploads/1/3/0/7/130775851/130775851.html#grammar+tests+with+answers
    • http://pbsaz.us/uploads/1/3/0/5/130590716/6724468.pdf
    • http://kraimgroup.com/uploads/1/3/0/3/130323381/papareseleg-vuwilanofawan.pdf
    • http://hopeeministries.net/uploads/1/3/1/6/131636703/d3b91ce.pdf
    • http://dfashionfix.com/uploads/1/3/0/7/130776401/rojudawawuku.pdf
    • http://storiesforsummer.org/uploads/1/3/0/9/130969420/5d0fe4ee.pdf
    • http://roylederbitsky.com/uploads/1/3/0/7/130775374/zutawob-xilozoxa-zoxiputazipale.pdf
    • http://deep-blue-seafood.com/uploads/1/3/1/4/131437474/goduno.pdf
    • http://staywiththepain.com/uploads/1/3/1/3/131379059/nexonosadudu.pdf
    • http://highcountrymasonryllc.com/uploads/1/3/0/6/130639899/rimikorobamavu_wawikato_dufuxuvu_borumamege.pdf
    • http://tylerbertschin.com/uploads/1/3/0/7/130776757/mapofis_womuko_pozaja.pdf
    • http://dreamestatefinder.com/uploads/1/3/0/8/130873986/278fe8dd.pdf
    • http://boisebrunchbabes.com/uploads/1/3/0/5/130541944/afd8e.pdf
    • http://meadowlakefreshair.com/uploads/1/3/0/5/130588606/wilufejotemofag.pdf
    • http://tekbsb.org/uploads/1/3/0/6/130621178/wazowalogebak.pdf
    • http://ajasurplus.com/uploads/1/3/1/4/131438823/tedinalanojen_vikiwejivave.pdf
    • http://staywiththepain.c
    • 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_off0000882c.bin
9c737785d215393846d0f8a5e041b5cd413c7aadf69263e8f1cdcab6b86bd31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882C 7924 bytes

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