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)
MD5: d03f6a47bcef3e70fe18b2558e49d5b1 SHA-1: 1ed012bdaa58812db2e2fa4259fb00e09e13eda7 SHA-256: a89b341c5f21acb3b28012f890e0027093e5b0697b003824e41613faaa736dcf
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicates malicious intent, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of outbound links suggests a high likelihood of user redirection to potentially harmful 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://nursingarmpillow.com/uploads/1/3/0/6/130603979/130603979.html#la+empresa+definicion+y+tipos
    • http://esgeneralconstruction.com/uploads/1/3/0/5/130588153/suwamufironokape.pdf
    • http://spartancork.com/uploads/1/3/0/7/130739542/gupafetuwuwomi.pdf
    • http://powercrafttools.com/uploads/1/3/0/4/130436040/jebexuj.pdf
    • http://sportsputting.com/uploads/1/3/0/7/130739697/lesusupobam.pdf
    • http://armsandmindsrenovations.com/uploads/1/3/0/2/130289695/gonedud.pdf
    • http://harmoniouslymad.com/uploads/1/3/0/4/130490245/995401.pdf
    • http://fodicamergator23.com/uploads/1/3/0/7/130775635/8576823.pdf
    • http://eciprocessing.com/uploads/1/3/0/7/130739904/189853.pdf
    • http://kissmenaughty.com/uploads/1/3/0/5/130539987/vapejunusesusam.pdf
    • http://thechildofprayer.com/uploads/1/3/0/5/130545643/3398300.pdf
    • http://taxfirmsolutions.com/uploads/1/3/0/7/130776580/1973207.pdf
    • http://singaporefineart.com/uploads/1/3/0/6/130603807/zoviwik-puzobafi.pdf
    • http://audioxproductions.com/uploads/1/3/0/6/130621119/1446123.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 3

Files carved from inside the sample during analysis.

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

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