Malicious PDF — malware analysis report

Static analysis result for SHA-256 492de8e55f138898…

MALICIOUS

PDF

44.4 KB Created: 2020-03-30 20:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: def1eff09d2bc767dd271739fc7105f5 SHA-1: 4e10b80bf25af7280e997fab5ec4172310a95d1a SHA-256: 492de8e55f138898821de08b8df290ea7f8f3bccc9a79d37b55a29d59bacb876
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Aswb bachelors practice test pdf' and several URLs, reinforcing the lure to click on external content. The primary attack pattern involves tricking the user into navigating to one of the numerous provided URLs.

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://misssupremepurityqueen.com/uploads/1/3/1/4/131438814/131438814.html#aswb+bachelors+practice+test+pdf
    • http://74-123-79-54.mgwnet.com/uploads/1/3/1/0/131070318/cef7040f45.pdf
    • http://2306lakeviewdr.com/uploads/1/3/0/6/130620185/6375779.pdf
    • http://thehappyschnauzerplace.com/uploads/1/3/0/2/130272347/9800356.pdf
    • http://academiacultural.pl/uploads/1/3/0/7/130775495/5084864.pdf
    • http://bellinghambob.org/uploads/1/3/0/3/130313089/ginivelufopifuwo.pdf
    • http://momentswithmj.net/uploads/1/3/0/4/130476483/lepekubel_nabenizavame.pdf
    • http://maenad-films.com/uploads/1/3/0/6/130639954/247b014d7f2f724.pdf
    • http://artfullyinspiredcoaching.com/uploads/1/3/1/3/131398444/tevefaruwaz.pdf
    • http://pagosatrees.com/uploads/1/3/0/4/130476589/banufekatamonew-zuzowazoxafe-dawapekif-guwuwetaforaji.pdf
    • http://kylekeenanracing.com/uploads/1/3/0/4/130489696/8260381.pdf
    • http://kommerx.com/uploads/1/3/1/4/131437503/lodetezat-vatibuxa.pdf
    • http://littleitalycb.com/uploads/1/3/1/1/131164475/7631471.pdf
    • http://matthewcbanner.com/uploads/1/3/1/4/131408942/salipigezenolewurus.pdf
    • http://dianehunterart.com/uploads/1/3/0/7/130740084/lemov-lakarunome-koxifokosilen-lajumugaguz.pdf
    • http://ecomarksplastics.com/uploads/1/3/0/7/130776788/xatigupape.pdf
    • http://businessclaimingservice.com/uploads/1/3/0/7/130776589/4595478.pdf
    • http://tavinimodadeboneca.com/uploads/1/3/0/8/130874161/6279540.pdf
    • http://halehonullc.com/uploads/1/3/0/2/130270742/f7b3fb5b544.pdf
    • http://schmitz-seasonal-services.com/uploads/1/3/0/7/130740538/bipuwup_sojezowujurero.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_off00008211.bin
5e612d5c8eb0ed72bbc20cc1d041304103f2d4d4076fb9c16895ed9aa205489c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8211 8508 bytes