Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7d829712a49a80…

MALICIOUS

PDF

34.6 KB Created: 2020-06-12 02:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34a5e9b847e3367aa44679288f5cc36f SHA-1: 58d7028fb2b6f9d273a2e63c2c59f40973e9b5e2 SHA-256: be7d829712a49a8034706fbfa2ba9bc22133ad41ae0de9a664fe4064d2895b83
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though malformed, contains text related to a 'meteorology study guide answers' and includes URLs, reinforcing the lure to external sites. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic indicates a pattern of hosting numerous PDF files on compromised or attacker-controlled domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cpanel.jacksonvilleartistsguild.org/uploads/1/3/0/2/130272355/130272355.html#meteorology+study+guide+answers
    • http://thisissmartoysters.com/uploads/1/3/0/3/130323162/920c35efed6f.pdf
    • http://laclasicataqueria.com/uploads/1/3/0/4/130489346/9f7708b.pdf
    • http://mailserver.andavis.co.uk/uploads/1/3/1/8/131856225/7512890.pdf
    • http://perception2019.com/uploads/1/3/0/6/130620853/8267f.pdf
    • http://ns1.anythingtech.org/uploads/1/3/1/4/131406390/8204814.pdf
    • http://flipnotik.com/uploads/1/3/0/7/130776719/bozuxara.pdf
    • http://qognitive.net/uploads/1/3/1/4/131455508/genize_xafuvizad.pdf
    • http://m2projects.net/uploads/1/3/0/9/130969291/vipipadutogosur.pdf
    • http://mta-sts.mx.wasatchfrontfence.com/uploads/1/3/1/3/131398077/b1dbbb1bfcaa.pdf
    • https://zagufebaja.files.wordpress.com/2020/06/tawogubilavomujepari.pdf
    • https://tododuk.files.wordpress.com/2020/06/94129261252.pdf
    • https://lojemaj.files.wordpress.com/2020/06/93579229853.pdf
    • https://satipukaza.files.wordpress.com/2020/06/parezutaraz.pdf
    • https://satugovanuw.files.wordpress.com/2020/06/fowos.pdf
    • https://lopititixuv.files.wordpress.com/2020/06/wuradave.pdf
    • https://refoxakel.files.wordpress.com/2020/06/xubevofaxujavexixusogiwa.pdf
    • https://kubuwenix.files.wordpress.com/2020/06/batikavuwafod.pdf
    • https://fewogixaba.files.wordpress.com/2020/06/zowufejerutagasisodojol.pdf
    • https://rovizemafogi.files.wordpress.com/2020/06/marejubodipivegopuwiwosit.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b76.bin
cef942c7d52f19ad95b878128b2fda2f49ca537542190390df2b88fc34970d9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B76 10404 bytes