Malicious PDF — malware analysis report

Static analysis result for SHA-256 91608a7156c114ac…

MALICIOUS

PDF

44.3 KB Created: 2020-04-01 15:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 268ef47a4144fbd2035a60a8c5895660 SHA-1: 7d8c9961007384473687f6608483b9876c489667 SHA-256: 91608a7156c114acf9b3d557c794bbc9654cf31af1a43ef1b94f3bafc7dccd07
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The document body is presented as a primary school math test, likely a lure to encourage users to click the embedded links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, but the extensive use of external URLs is a strong indicator of a phishing or malware distribution attempt.

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://ourmotherofsorrows.church/uploads/1/3/0/5/130590596/130590596.html#prueba+de+entrada+de+matematica+para+primer+grado+de+primaria
    • http://worldheartsfairtrade.org/uploads/1/3/0/5/130588947/radopodatixazeg_kerepuzowopob_nizowo_tirit.pdf
    • http://appsmoredetailscureapss.com/uploads/1/3/0/5/130588721/6834645.pdf
    • http://techie-designs.com/uploads/1/3/0/4/130483973/f7ba63235e0.pdf
    • http://afrealty.ch/uploads/1/3/0/2/130291365/temesosaku.pdf
    • http://www.flyepiphany.com/uploads/1/3/1/3/131380547/wifemagodonazumurowe.pdf
    • http://slaccountingsolutions.com/uploads/1/3/0/8/130873932/vitafu_wizawud_kanujemomemuwu.pdf
    • http://thebridgeofhopeinc.org/uploads/1/3/0/9/130970023/wepazuso_dufuworugipu_gobejunobop_kevexekis.pdf
    • http://moabarealanduse.com/uploads/1/3/0/6/130622038/gepodetej-sidafizipesexad.pdf
    • http://happyorangutan.net/uploads/1/3/0/8/130874457/48b97bf656d38a6.pdf
    • http://hempbiz.org/uploads/1/3/0/4/130476150/xitinumitasojeji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006877.bin
c5305d912d337ba56a06de2729fe864ee4241706a2d8a0b6caf3223acac51628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6877 10192 bytes
font_01_sfnt_off00008c87.bin
99c5a563bd14079918bfffdbdfd95054cabbef0c47e0e3eb61f716c3cd559389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C87 16124 bytes

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