Malicious PDF — malware analysis report

Static analysis result for SHA-256 752342c68d9a1fd3…

MALICIOUS

PDF

38.8 KB Created: 2020-06-09 05:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e7c9933d3b1caec67657b7c4e828bb SHA-1: 40bfcc91ec4aa67727f9904f298717dd2f19958f SHA-256: 752342c68d9a1fd3dd16ad8a0d47e3ab7c2a96eeb7985c516877e0118090fa9a
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm findings. The primary attack pattern appears to be SEO manipulation or the distribution of malicious content via a link farm.

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://dantoned.com/uploads/1/3/1/3/131382030/131382030.html#Beispiele+f%25C3%25BCr+selbstverwaltete+teams
    • http://gopropaintingservices.com/uploads/1/3/0/5/130550663/paxum.pdf
    • http://autodiscover.amorim-neuropsychologue.fr/uploads/1/3/1/3/131380983/4355839.pdf
    • http://fortwaynezerolimitz.com/uploads/1/3/0/6/130621300/7324168.pdf
    • http://weaverpaving.com/uploads/1/3/0/5/130588681/8924959.pdf
    • http://themexicankitchencompany.com/uploads/1/3/0/3/130379205/bofatizafetonol-nozomegumorudid-kanatoz-bilotodu.pdf
    • http://dsc.maraludwig.com/uploads/1/3/0/6/130640067/c4430381c1.pdf
    • http://billyprudhomme.com/uploads/1/3/1/0/131069777/gufumujajodokavagun.pdf
    • http://acupuncture-in-arcata.com/uploads/1/3/1/4/131438228/tidisofoxod-jidadagope-niwekipibuga.pdf
    • http://mail.ncrdolphins.com/uploads/1/3/0/4/130476129/1343dfbab0fc60.pdf
    • http://momilitaryneeds.org/uploads/1/3/1/8/131856746/391f6be79.pdf
    • http://brownscarpetcare.net/uploads/1/3/1/0/131070227/buvinupabege.pdf
    • http://mail.chardontomorrow.org/uploads/1/3/0/9/130969238/verakalogu_bixesuvu_runen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://legukomos.files.wordpress.com/2020/06/35976707144.pdf
    • https://jawuvagim.files.wordpress.com/2020/06/muguzinera.pdf
    • https://vitasaven.files.wordpress.com/2020/06/lerapijeli.pdf
    • https://ziganopu.files.wordpress.com/2020/06/51385731458.pdf
    • https://sedibim.files.wordpress.com/2020/06/24456118866.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068cc.bin
75e4ca9a0fdef4a608b8a9efffbad6211e6ea73211f98bf97744e4efe0215109
pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 11196 bytes