Malicious PDF — malware analysis report

Static analysis result for SHA-256 6187a28050c8e7b1…

MALICIOUS

PDF

44.0 KB Created: 2020-04-30 05:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d504534fd2fa94f67fd1fd1c02e12db4 SHA-1: 2c14d945f1e161ee909acb5eced6b3cd86bc5abf SHA-256: 6187a28050c8e7b1f119449e7c6fb7148ddeac3a40c8905bdc19362fdc02e100
96 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 seemingly unrelated content, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

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://sweetridersexpressllc.com/uploads/1/3/0/6/130639549/130639549.html#singapore+math+worksheets+grade+2+pdf
    • http://gowiththefloat.com/uploads/1/3/1/1/131163931/busita_fazojotukubazuz.pdf
    • http://211inc.org/uploads/1/3/1/4/131452884/3815a96dc26.pdf
    • http://biideo.com/uploads/1/3/0/7/130775730/wenimaduvawabur.pdf
    • http://babesinspandex.com/uploads/1/3/1/6/131636855/597055.pdf
    • http://salmanelmi.com/uploads/1/3/0/8/130813855/vazarej_linidojovenuvak.pdf
    • http://steamwaycarpetcleaning.net/uploads/1/3/0/2/130274355/telojakozaro-fatobazitumal.pdf
    • http://universal-tao.at/uploads/1/3/0/2/130270900/886d6c21c6303.pdf
    • http://peobroke.com/uploads/1/3/0/7/130775195/6cb2b76c7536e.pdf
    • http://gsautoinsurance.com/uploads/1/3/0/4/130488213/jirazakepivu.pdf
    • http://vasecleaner.com/uploads/1/3/1/4/131406239/lanefep.pdf
    • http://lstailor.com/uploads/1/3/1/4/131437369/lutemakufawum-xibilakafifuma-texevewevon.pdf
    • http://fostoriaindustries.com/uploads/1/3/0/8/130873899/timuxivawiba-woxifege-dagirumav.pdf
    • http://qualitystillexists.com/uploads/1/3/0/6/130639976/damisivitagade.pdf
    • http://baltimorebiodiesel.com/uploads/1/3/1/4/131437978/kekigupi.pdf
    • http://woooah.shop/uploads/1/3/0/8/130814718/b4554d3.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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007467.bin
80c263a5b3615bf099cbe0fb95b5534a98e2179565d98e08725a4a73dbc17f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 8576 bytes
font_01_sfnt_off0000954f.bin
1671d4a6506f7deedb25c13781f115618252e1b93a4aad0bce3c1125e559b732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x954F 4388 bytes

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