Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e010b5cfa7add55…

MALICIOUS

PDF

69.8 KB Created: 2020-05-15 12:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 857f5a8368889c5c8e278368173e6d98 SHA-1: dc8a7f5b016df376c80d61e5cd2bedd27a0bfd8b SHA-256: 5e010b5cfa7add557ff463438b94720e5a0cf0767cff5ac55fe8d3fd7e5ec285
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mooreconsultingsolutions.com/uploads/1/3/0/2/130271142/130271142.html#bioreactor+system+design+asenjo+pdf
    • http://krisanticompany.com/uploads/1/3/0/4/130489081/bomegelemexebe-sovigevarifape-nimapebegipi-lenejewukiwera.pdf
    • http://papermoonla.com/uploads/1/3/0/4/130435819/wezapuvaza.pdf
    • http://gozelda.net/uploads/1/3/1/8/131871856/bepofugogeki-jixake.pdf
    • http://ricardomartinez.ca/uploads/1/3/1/3/131383981/numubotopiz.pdf
    • http://peoplefirsthc.com/uploads/1/3/0/5/130590019/ae02d69c69e.pdf
    • http://ourmothershelper.com/uploads/1/3/1/4/131484467/bokeseluluni.pdf
    • http://k208repairkit.com/uploads/1/3/0/5/130545882/6400757.pdf
    • http://maxjadue.com/uploads/1/3/0/6/130620341/bisawopudif_wabarefakake_jidusot_xeraduxodewizuv.pdf
    • http://pnwdirect.com/uploads/1/3/0/6/130640004/fivojera.pdf
    • http://bossworks.ca/uploads/1/3/0/6/130621352/lolalegeli.pdf
    • http://abdulmakki.com/uploads/1/3/0/4/130483285/4713124.pdf
    • http://shanewittig.com/uploads/1/3/0/6/130604616/raler.pdf
    • http://overiceapparel.com/uploads/1/3/0/5/130539270/lerufibasemik.pdf
    • http://asthebookpageturns.com/uploads/1/3/1/6/131637850/xuredizo.pdf
    • http://colorsoundandart.com/uploads/1/3/0/6/130622104/kapojoresuk.pdf
    • http://yslab.org/uploads/1/3/0/3/130313127/f714b5a2e8b76a.pdf
    • http://htoursi.com/uploads/1/3/0/6/130639344/mojubunazumagijokigo.pdf
    • http://artimpact.org/uploads/1/3/0/5/130543740/megavigetefebo.pdf
    • http://newoutsiderart.com/uploads/1/3/0/8/130814298/dcedc8c9010836.pdf
    • http://teamhuffmanadoptionfundraising.com/uploads/1/3/0/2/130289179/rivitoxugefofidosabo.pdf
    • http://sweadvisory.com/uploads/1/3/0/2/130273978/1468002.pdf
    • http://wavemanwealth.com/uploads/1/3/0/5/130550800/9433516.pdf
    • http://filmi-gaane.com/uploads/1/3/1/8/131858172/5f121f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc5.bin
26947735208a341317940e1df0bd77b3c7c80047d46a70e7fa5c8e295418e9f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 13612 bytes

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