Malicious PDF — malware analysis report

Static analysis result for SHA-256 793b69d38e3ac1a8…

MALICIOUS

PDF

42.3 KB Created: 2020-03-29 12:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 39eea0bb9d12876066a122ce05975082 SHA-1: f5bc3f7c051cff0d885deb861fde342d6252a640 SHA-256: 793b69d38e3ac1a872c2463ffc19357e3834c3f17dd20e9c4fdf73b3a09b3931
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of outbound links suggests a watering hole or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bernardobellostudio.com/uploads/1/3/0/7/130775052/130775052.html#graco+390+pc+stand
    • http://jameshuntermarshall.com/uploads/1/3/1/1/131163550/wixaro.pdf
    • http://jabaribrisport.com/uploads/1/3/0/5/130590664/litobuwibowap.pdf
    • http://cutcolorculture.com/uploads/1/3/0/6/130604420/3435341.pdf
    • http://norjenes.com/uploads/1/3/0/7/130740062/d92be7df.pdf
    • http://bartbenson.com/uploads/1/3/1/3/131379382/329f4f52f56ab.pdf
    • http://mcs-lawyers.com/uploads/1/3/0/7/130775380/0cda96b508db4df.pdf
    • http://lifeonislandtime.com/uploads/1/3/1/4/131406560/rulivinomavinopi.pdf
    • http://bobcatspanish.com/uploads/1/3/1/4/131407042/5903024.pdf
    • http://spacecenterfamilypractice.net/uploads/1/3/0/4/130488850/2459225.pdf
    • http://bampteam.com/uploads/1/3/0/7/130740206/sanirevelizix.pdf
    • http://thebestvisit.com/uploads/1/3/0/4/130483514/e52fa7ed32a5ebc.pdf
    • http://dmasportsgroup.com/uploads/1/3/1/1/131163772/8928234.pdf
    • http://alsieclay.com/uploads/1/3/0/2/130271080/ribojimonogi.pdf
    • http://tadamidisenos.com/uploads/1/3/0/3/130313612/tusiwekiruzubut.pdf
    • http://partij-neeleman.nl/uploads/1/3/0/4/130488513/fimimanulirivug.pdf
    • http://nathanquintanar.com/uploads/1/3/1/0/131070525/2834422dbb.pdf
    • http://iglesiabautistafundamentalemanuel.org/uploads/1/3/0/8/130814011/5281514.pdf
    • http://sweetlifeproperties.org/uploads/1/3/0/8/130874007/gekemasazamog-rajotix-xubaroveraru-zuxurim.pdf
    • http://localmarketinghub.net/uploads/1/3/0/5/130544078/2248516.pdf
    • http://greenleafcommunityfarm.com/uploads/1/3/0/3/130323158/rezavowusitogagepoji.pdf
    • http://breadandbutter-inc.com/uploads/1/3/0/9/130969222/fexomatene.pdf
    • http://lyonsandlamb.shop/uploads/1/3/0/4/130489417/xogefubopo.pdf
    • http://vincenzolittleitaly.com/uploads/1/3/0/6/130621952/64f65faf4.pdf
    • http://dkgebaeudeservice.de/uploads/1/3/0/8/130813899/vukotokubi.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_off00007bf6.bin
dcd9996d571d047f2416d0611c0167dc3ba371f5aada6450aed69a87c4a8d729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF6 8232 bytes

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