Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3a2e2f7828e765…

MALICIOUS

PDF

41.6 KB Created: 2020-04-09 14:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb87e8ed97d25af666262c930269feaa SHA-1: ed037c633c12ed501c936df99a3d2919a23d6dd2 SHA-256: ff3a2e2f7828e765a3755a7b6eceb9319539b5f5da8b34f99584eb2fd5adc5ef
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO spam or link farm schemes to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially obfuscated, contains text related to headers and footers, and the embedded URLs point to similarly structured PDF files on various domains, suggesting a coordinated effort to generate traffic or distribute further content.

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://glazingsolutionswa.com/uploads/1/3/0/2/130270781/130270781.html#que+es+el+encabezado+y+pie+de+pagina
    • http://sxmcarrentals.com/uploads/1/3/0/8/130815192/xadidunofe.pdf
    • http://np4p.org/uploads/1/3/1/4/131437926/3232022.pdf
    • http://imaginarypeeps.com/uploads/1/3/0/6/130639953/vofokek.pdf
    • http://clermontplantsale.com/uploads/1/3/0/3/130323672/majawezezax.pdf
    • http://absoluteartco.com/uploads/1/3/0/5/130543466/vatizerove_deputejiguv_kavonifosi_lowifima.pdf
    • http://krystallkroner.com/uploads/1/3/0/5/130539227/5108139.pdf
    • http://cantysbookshop.com/uploads/1/3/0/6/130604112/c508287998da.pdf
    • http://sandiegowritersretreat.com/uploads/1/3/1/4/131438761/noluxus_ladujukodas_kaxawedomo.pdf
    • http://thequiltstudio.com/uploads/1/3/0/8/130813798/2705697.pdf
    • http://midwifeaddison.com/uploads/1/3/0/4/130490151/kupatasevolefopuke.pdf
    • http://allmybillspaid.com/uploads/1/3/0/5/130588705/8808996.pdf
    • http://pezularealty.com/uploads/1/3/1/4/131407958/besof.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_off0000794e.bin
40c339e291aeaef49771936194bc1d0b3ce823f89bcbc8d5d109e2cb2b0b9fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794E 8260 bytes

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