Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f35a79ca1cde63…

MALICIOUS

PDF

39.2 KB Created: 2020-03-15 06:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d9d7fbc96a0357f88a413e145b826fc0 SHA-1: 980e34e18672afe35b179061747216ce30097b8d SHA-256: 75f35a79ca1cde63afb77128ee5f7e6a19ed4fa775a4cb30e0b372e2ff0f71fd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 spam tactic. The primary URL, http://avabaycompany.com/uploads/1/3/0/7/130740562/130740562.html#fbise+date+sheet+hssc+11+2019, is presented as an academic document, likely a lure to drive traffic to malicious or spam sites. The ML classifier strongly supports the malicious nature of this PDF.

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://avabaycompany.com/uploads/1/3/0/7/130740562/130740562.html#fbise+date+sheet+hssc+11+2019
    • http://organiccrafttea.com/uploads/1/3/0/4/130435646/6ca7c9a9abcd9.pdf
    • http://kidsphilharmonic.com/uploads/1/3/0/4/130490461/205eb96517416c0.pdf
    • http://modelsenden.com/uploads/1/3/0/6/130620590/tiduzuge-raribasumemoz.pdf
    • http://tristarlogos.com/uploads/1/3/0/3/130323632/f19315.pdf
    • http://fubesac.store/uploads/1/3/0/2/130288986/34a54c4.pdf
    • http://silverlinehospital.net/uploads/1/3/0/2/130270799/67734c573829d6.pdf
    • http://www.malamamentoring.org/uploads/1/3/0/6/130604470/gazelotopabib.pdf
    • http://www.adventuretimeonline.com/uploads/1/3/0/8/130814926/36fb39dfe408a24.pdf
    • http://www.kyles-senior-pic-1.kaseyfraley-photography.com/uploads/1/3/0/2/130287923/sejoxajin-kagelizuk-dawinizewegej-sudusifiz.pdf
    • http://www.bewear2kxtensions.org/uploads/1/3/0/7/130738661/4655732.pdf
    • http://www.citasonlinepasaporte.com/uploads/1/3/0/5/130543019/doraguwiku.pdf
    • http://dailycoinwatch.com/uploads/1/3/0/7/130739619/35ac35ae.pdf
    • http://monolithcomputing.com/uploads/1/3/0/6/130604919/c18fe65e6d.pdf
    • http://hoatientrans.com/uploads/1/3/0/6/130639052/pegibuxifi.pdf
    • http://hostmaster.weliketosmoothit.co.uk/uploads/1/3/0/4/130435582/d4a778af6a.pdf
    • http://bigleaffarms.com/uploads/1/3/0/6/130605471/a9da6c3de.pdf
    • http://ricemachining.com/uploads/1/3/0/5/130551597/2104971.pdf
    • http://autodiscover.made-by-nature.be/uploads/1/3/0/6/130640141/4234273.pdf
    • http://www.lipsticknts.com/uploads/1/3/0/2/130289278/supog-xatabakaxipaje-jelasag.pdf
    • http://stageworkslouisiana.com/uploads/1/3/0/8/130874157/saropujujamepam-zafagejaz.pdf
    • http://ameliaschatt.com/uploads/1/3/0/7/130776088/tevorinutofamo_buzogupakuresaj.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_off000071c4.bin
2334e8f4517344817b66559d729ff994bf82db5bf1cefa21810ea2f1c90e1ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C4 7080 bytes