Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63a4b1432b4c585…

MALICIOUS

PDF

38.1 KB Created: 2020-03-19 11:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 218bb95b1ff2f8718950a5612d304027 SHA-1: 179acdfed60d7c596848bc41c6a891c82dfaa293 SHA-256: a63a4b1432b4c585113d581d6d1f1a73bb8cfe60fb3e9049e21dea40cdc75030
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body text, though partially corrupted, includes a reference to a wiring diagram, suggesting a lure to entice users to click on the embedded URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the numerous external links.

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://2020blue.org/uploads/1/3/0/2/130287923/130287923.html#kicker+cvr+12+2+ohm+wiring+diagram
    • http://74-123-76-177.mgwnet.com/uploads/1/3/0/6/130605204/sofokem-dekisuku.pdf
    • http://faithyvonnem.com/uploads/1/3/0/6/130639836/af3eb8cf63bfd4d.pdf
    • http://www.thewheeldeals.com/uploads/1/3/0/2/130288577/7525141ef.pdf
    • http://www.kxxvii.com/uploads/1/3/0/7/130739154/wanulixinipavifoju.pdf
    • http://landsitesavailable.com/uploads/1/3/0/7/130738882/gewedasusaxoreku.pdf
    • http://mx.eidia.com/uploads/1/3/0/5/130551670/4274943.pdf
    • http://jeannehosp.com/uploads/1/3/0/8/130873855/8bca04554112.pdf
    • http://www.nwreikicenter.org/uploads/1/3/0/6/130620364/5576682.pdf
    • http://www.spacecreationdesign.com/uploads/1/3/0/7/130776299/nirifo.pdf
    • http://corusoldgolfhouse.devsite-1.com/uploads/1/3/0/6/130604218/76440e.pdf
    • http://lot4lloyds.com.au/uploads/1/3/0/3/130323092/tipimipefafedeloturo.pdf
    • http://txautoglass.org/uploads/1/3/1/0/131070611/5fb9ede5a67f284.pdf
    • http://www.ftscwomensindoorcup.com/uploads/1/3/0/9/130969151/0be7a105cf80d0e.pdf
    • http://modvintiqueinteriors.com/uploads/1/3/0/2/130288502/fojonenilewoxe-sagijuj.pdf
    • http://www.winderswise.com/uploads/1/3/0/2/130273789/lepegepidofow.pdf
    • http://dermascapes.com/uploads/1/3/0/6/130621533/302320.pdf
    • http://littlethinkers.net/uploads/1/3/0/7/130739962/xubiwu.pdf
    • http://bluetapeconstruction.us/uploads/1/3/0/7/130776612/vulanuzerive.pdf
    • http://littyo.com/uploads/1/3/0/5/130590622/gokamixij.pdf
    • http://www.thelangsisters.com/uploads/1/3/0/5/130546804/c043d69.pdf
    • http://readingrescuetalk.com/uploads/1/3/0/3/130379634/2208ccfb5eac4.pdf
    • http://www.ajtve.com/uploads/1/3/0/8/130813577/dejufinux.pdf
    • http://greenleafchiropractic.com/uploads/1/3/1/0/131070526/4490059.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_off00006e0f.bin
c4f00d2b7f1d6e93d7ac8adcd4268ffe18b6b84b7619a172f5f8f41c8d81afc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0F 7372 bytes

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