Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89b341c5f21acb3…

MALICIOUS

PDF

69.9 KB Created: 2020-03-30 09:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: d03f6a47bcef3e70fe18b2558e49d5b1 SHA-1: 1ed012bdaa58812db2e2fa4259fb00e09e13eda7 SHA-256: a89b341c5f21acb3b28012f890e0027093e5b0697b003824e41613faaa736dcf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The embedded URL http://nursingarmpillow.com/uploads/1/3/0/6/130603979/130603979.html#la+empresa+definicion+y+tipos is also present in the document body. While no scripts were explicitly extracted, the nature of the link farm and the ML classification indicate malicious intent, likely to redirect users to potentially harmful sites.

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://nursingarmpillow.com/uploads/1/3/0/6/130603979/130603979.html#la+empresa+definicion+y+tipos PDF link annotation
    • http://esgeneralconstruction.com/uploads/1/3/0/5/130588153/suwamufironokape.pdfIn PDF document text
    • http://spartancork.com/uploads/1/3/0/7/130739542/gupafetuwuwomi.pdfIn PDF document text
    • http://powercrafttools.com/uploads/1/3/0/4/130436040/jebexuj.pdfIn PDF document text
    • http://sportsputting.com/uploads/1/3/0/7/130739697/lesusupobam.pdfIn PDF document text
    • http://armsandmindsrenovations.com/uploads/1/3/0/2/130289695/gonedud.pdfIn PDF document text
    • http://harmoniouslymad.com/uploads/1/3/0/4/130490245/995401.pdfIn PDF document text
    • http://fodicamergator23.com/uploads/1/3/0/7/130775635/8576823.pdfIn PDF document text
    • http://eciprocessing.com/uploads/1/3/0/7/130739904/189853.pdfIn PDF document text
    • http://kissmenaughty.com/uploads/1/3/0/5/130539987/vapejunusesusam.pdfIn PDF document text
    • http://thechildofprayer.com/uploads/1/3/0/5/130545643/3398300.pdfIn PDF document text
    • http://taxfirmsolutions.com/uploads/1/3/0/7/130776580/1973207.pdfIn PDF document text
    • http://singaporefineart.com/uploads/1/3/0/6/130603807/zoviwik-puzobafi.pdfIn PDF document text
    • http://audioxproductions.com/uploads/1/3/0/6/130621119/1446123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 10756 bytes
SHA-256: 860ac67456e156ba81b3e2d8cac11fc9da5ac975885110e0c683ba57a9ab27d5
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 2652 bytes
SHA-256: e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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