Malicious PDF — malware analysis report

Static analysis result for SHA-256 062a67020aadcc8d…

MALICIOUS

PDF

39.2 KB Created: 2020-04-17 05:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2203d24134d3a8ef6388b4d49d90cc0e SHA-1: 090050eabba77c0e17b336ff1c7fcb71fe789b98 SHA-256: 062a67020aadcc8d143ef5eb639a48e57a77d3a6356e75a978e7e110a15f9317
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 other PDF files on different domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to manipulate search engine results or redirect users to potentially malicious 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://poweredbytheblueoval.com/uploads/1/3/0/6/130639317/130639317.html#spain+chick+corea+sheet+music+real+book
    • http://brileroy.com/uploads/1/3/0/8/130874612/wipobasojukanag.pdf
    • http://greshampaving.com/uploads/1/3/0/6/130639133/8be4659f7f51440.pdf
    • http://pernine.com/uploads/1/3/0/6/130604180/mupewonigo.pdf
    • http://detailsdone.com/uploads/1/3/0/6/130639807/menumav-volez.pdf
    • http://kingstreetrocks.com/uploads/1/3/0/5/130588268/mixuvopenutirux.pdf
    • http://manifestyouniversity.com/uploads/1/3/0/4/130435892/2529640.pdf
    • http://www.empirekoi.com/uploads/1/3/0/6/130620624/debomar_musalawativ_werulale.pdf
    • http://robenvoigt.com/uploads/1/3/1/4/131453901/ridoxi.pdf
    • http://orinocoio.com/uploads/1/3/0/5/130543462/wevogalelufumoluk.pdf
    • http://coolshitproductions.com/uploads/1/3/0/6/130605374/tafibarajina_fizutanaxu_tejuduzawipopok.pdf
    • http://johnjburkhardt.com/uploads/1/3/0/2/130273748/sedinudopitunid_mofigulib.pdf
    • http://oxnarddj.com/uploads/1/3/0/5/130551559/wegawisade-zitumonizeve-xilak-mabezerojiru.pdf
    • http://r4insights.com/uploads/1/3/0/6/130620520/834afb.pdf
    • http://valiantrepairs.com/uploads/1/3/0/7/130776492/tumekupowaleka.pdf
    • http://newenglandgoodlife.org/uploads/1/3/0/5/130551641/8508475.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_off00006ed8.bin
ba3e563670d67848cda56917b430ef952be36581152db981c0e17dd25c62684a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 8348 bytes

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