Malicious PDF — malware analysis report

Static analysis result for SHA-256 781e353bc0254492…

MALICIOUS

PDF

35.7 KB Created: 2018-06-11 08:31:56 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 3ed388fb16921da5fe7f8268ccdf5fc1 SHA-1: e1f12de2c0c6ed78d0f290fc5a4421a490ff9612 SHA-256: 781e353bc02544924acab760386fe9fafe4c82281a05f17ec6e69f52b940ff43
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and a specific heuristic for being a fake download lure, indicating a malicious intent. It contains embedded URLs pointing to 'uncpbisdegree.com', which are likely used to serve a secondary payload. The document body, though partially corrupted, contains references to these URLs and appears to be a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://uncpbisdegree.com/download3.php?q=spoiled-brats-stories-simon-rich.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=spoiled-brats-stories-simon-rich.pdfIn PDF document text
    • http://www.simonrich.com/In PDF document text
    • http://mcstories.com/Titles/B.htmlIn PDF document text
    • http://www.chicagospankingreview.org/comicsdb/comics_data_base.phpIn PDF document text
    • http://www.preceptaustin.org/luke-7-commentaryIn PDF document text
    • http://porno-rips.com/In PDF document text
    • https://pornorips.com/In PDF document text
    • https://www.siterips.org/In PDF document text
    • http://www.critcononline.com/exploitation.htmIn PDF document text
    • https://www.datalounge.com/thread/20881901-sam-heughan-closeted-gay-actor-lead-in-outlander-hiddleswift-2.0-part-30In PDF document text
    • http://www.armaghplanet.com/blog/the-truth-about-the-black-knight-satellite-mystery.htmlIn PDF document text
    • http://www.preceptaustin.org/mt_51-12_sermons-brian_billIn PDF document text
    • http://www.critcononline.com/thrillerIn PDF document text
    • http://www.sanaristikot.net/keskustelut/?id=5225In PDF document text
    • https://apbweb.com/hard-keep-caring/In PDF document text
    • https://www.ticketsglasgow.com/Pages/home.aspx?_escaped_fragment_=&_escaped_fragment_=In PDF document text
    • http://riverside-resort.net/1/the-friendship-doll-kirby-larson.pdfIn PDF document text
    • http://riverside-resort.net/1/the-60-second-shrink-101-strategies-for-staying-sane-in-a-crazy-world-1st-jaico-impression.pdfIn PDF document text
    • http://riverside-resort.net/1/the-daily-express-small-crosswords-4-daily-express-puzzle-books.pdfIn PDF document text
    • http://riverside-resort.net/1/the-inclusive-bible-first-egalitarian-translation-priests-for-equality.pdfIn PDF document text
    • http://riverside-resort.net/1/survey-of-operating-systems-third-edition-chapter-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/together-with-physics-class-12-solutions-free-download.pdfIn PDF document text
    • http://riverside-resort.net/1/to-the-edge-and-back.pdfIn PDF document text
    • http://riverside-resort.net/1/tr-350-70.pdfIn PDF document text
    • http://riverside-resort.net/1/spring-forward-the-annual-madness-of-daylight-saving-time-revised-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-essentials-of-sport-and-exercise-nutrition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/Simon_RichIn PDF document text
    • http://www.dailymail.co.uk/news/article-2253370/Christmas-sucks-Dozens-spoiled-brats-Twitter-complain-getting-presents-wanted.htmlIn PDF document text
    • http://www.nifty.org/nifty/prolific.htmlIn PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Fridge/MiraculousLadybugIn PDF document text
    • http://www.mtv.com/showsIn PDF document text
    • https://abcnews.go.com/SportsIn PDF document text
    • https://www.yahoo.com/lifestyle/tagged/health/In PDF document text
    • http://www.dailymail.co.uk/tvshowbiz/article-2108930/Freddie-Fox-son-Edward-Fox-determined-hit-big-time-merit.htmlIn PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/AngstWhatAngstIn PDF document text
    • http://gutenberg.net.au/ebooks01/0100281h.htmlIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e5a.bin
f90158c6d79eedf4611b3361fff399e0bf41b80ced8d591eb68c0041cd8e05bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5A 11072 bytes
font_01_sfnt_off0000716d.bin
7235cbb1342123228632e3c6912217818b7a6c6874093339d5ab53dc6150ef61
pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 6836 bytes