Malicious PDF — malware analysis report

Static analysis result for SHA-256 1884bb37d975fb76…

MALICIOUS

PDF

33.4 KB Created: 2020-05-18 16:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b261b0fa6d5c9d1ee12fcf48335e85d1 SHA-1: a1615c559b605adee92cf01da7fe24ebff69dada SHA-256: 1884bb37d975fb7656d5722ea16c73eef436962b577424f51f2f2f4bf89b7d65
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a "PDF link farm", suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the sheer volume of linked domains indicates a coordinated effort to host or distribute malicious files.

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://scrapyardfort.com/uploads/1/3/1/4/131407036/131407036.html#solucionario+estadistica+montgomery
    • http://rettklaer.com/uploads/1/3/0/3/130379163/xiwiwelagakumi-wilogef-bokijovaxiv.pdf
    • http://sarasotabirthcenter.com/uploads/1/3/0/6/130639885/51c3c96.pdf
    • http://garanardconsulting.com/uploads/1/3/0/5/130539913/7940635.pdf
    • http://hilismasonryllc.com/uploads/1/3/0/6/130621838/6536640.pdf
    • http://tylertxdrywall.com/uploads/1/3/1/4/131482939/rurowov.pdf
    • http://the-whole-thing.com/uploads/1/3/1/3/131382486/lutunazerizipafi.pdf
    • http://oakeshottpropertysolutions.com/uploads/1/3/0/4/130435929/1503744.pdf
    • http://aspaceintime.net/uploads/1/3/0/7/130739080/lifotimopapu.pdf
    • http://animassageacademie.ca/uploads/1/3/1/4/131453555/nuwade.pdf
    • http://devinerinstudios.com/uploads/1/3/0/5/130539696/0b4a908087fdc19.pdf
    • http://businessone01.com/uploads/1/3/0/6/130621072/rosetixowalapufeb.pdf
    • http://abhisnacks.com/uploads/1/3/0/7/130739267/fc55d0069ed48c7.pdf
    • http://eivindvik-fjordhotell.no/uploads/1/3/0/3/130379326/maxezen-povamokek-buwuxowuwina.pdf
    • http://aablgrp.com/uploads/1/3/0/7/130739192/25ae67.pdf
    • http://languageliveonline.com/uploads/1/3/0/5/130588492/wowuxaxojuta.pdf
    • http://careerleapservices.com/uploads/1/3/0/6/130639856/1d0c083e.pdf
    • http://donnaleephotography.com/uploads/1/3/0/6/130639082/ledejorugadukadiw.pdf
    • http://hangarandland.com/uploads/1/3/0/7/130775795/7032386.pdf
    • http://commonconverse.com/uploads/1/3/0/7/130776338/jeputu-larabajolifot.pdf
    • http://prcreliable.com/uploads/1/3/0/4/130491947/rararozetapi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005768.bin
cd2b400c5a398e338ea412f7a18e7c7df0d476b427393c90045074a93be3c6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5768 10444 bytes

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