Malicious PDF — malware analysis report

Static analysis result for SHA-256 019818bf4e4326e3…

MALICIOUS

PDF

49.9 KB Created: 2020-04-07 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a58b22084d2b67a2e57139caf688784 SHA-1: 6a2074957c2c2d9ec2bae96f09eb3d4ea8df5fb0 SHA-256: 019818bf4e4326e3e5d2da46654925a6da611edd94167f657c1d1e87fded512c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a link farm or SEO manipulation scheme designed to distribute further 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://fortheloveofrose.com/uploads/1/3/0/6/130620537/130620537.html#fibratos+mecanismo+de+accion+vademecum
    • http://powerexproduction.com/uploads/1/3/0/4/130476887/5985479.pdf
    • http://shaneakira.com/uploads/1/3/0/6/130603943/ketid.pdf
    • http://snitchesgetstitches.net/uploads/1/3/0/3/130379206/c9bad.pdf
    • http://graceturnerofficial.com/uploads/1/3/0/7/130775339/podofubome.pdf
    • http://jewelrybynorthernlights.com/uploads/1/3/0/5/130545882/4c43a74b5b0.pdf
    • http://floackermans.com/uploads/1/3/0/4/130435791/2912373.pdf
    • http://howtheheckwouldiknowthat.com/uploads/1/3/1/4/131454586/24a117544cdedb6.pdf
    • http://efa.ms/uploads/1/3/1/0/131070727/c60237.pdf
    • http://cesletterresponse.com/uploads/1/3/0/2/130289363/5425963.pdf
    • http://lemontreegiftsstorecom.com/uploads/1/3/0/4/130483302/lamuro.pdf
    • http://maybrothersdentallab.com/uploads/1/3/0/5/130543813/denuvu.pdf
    • http://gtechniqtraining.com/uploads/1/3/0/3/130324288/fijigekib_pibolotugufix_sufewukis_newaki.pdf
    • http://billingsequestrian.com/uploads/1/3/0/7/130740429/78d675.pdf
    • http://neverforgetthewarriors.com/uploads/1/3/0/9/130969652/nanad.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007843.bin
1d7a1213a56d2372f422589a32356de9eecf15a107c52744ec3e1a4443838a26
pdf-font-stream PDF embedded font (sfnt) at offset 0x7843 9604 bytes
font_01_sfnt_off000099f9.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x99F9 2652 bytes
font_02_sfnt_off0000a360.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xA360 16036 bytes