Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e758f525c358db0…

MALICIOUS

PDF

50.4 KB Created: 2020-04-11 01:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc67fd51aad6d709dad8adea0c42c8dc SHA-1: 02353e2b92b3ef127617f65ed96b8b16f12b99b7 SHA-256: 3e758f525c358db04ea6d2639bfd5efd810a3850f69d8164fce04cfd9188dfbf
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The ML classifier strongly indicated maliciousness. The primary URL, http://74-123-72-211.mgwnet.com/uploads/1/3/1/3/131379730/131379730.html#alvenaria+de+cantaria, is likely the intended destination for the user, leading to further 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://74-123-72-211.mgwnet.com/uploads/1/3/1/3/131379730/131379730.html#alvenaria+de+cantaria
    • http://handipapers.com/uploads/1/3/0/5/130538839/tomimidugolonipag.pdf
    • http://morphmylogo.com/uploads/1/3/0/9/130969503/sejaminegiviba.pdf
    • http://fixedearth.com/uploads/1/3/0/7/130776142/dotogejurukagizifego.pdf
    • http://1988ltb.com/uploads/1/3/1/3/131380456/3eb1ac2544dc01.pdf
    • http://carribianscents.com/uploads/1/3/0/6/130639244/maxapawebola_vodix.pdf
    • http://podcastrv.com/uploads/1/3/0/2/130273913/2913076.pdf
    • http://bestmarinecomposites.com/uploads/1/3/1/4/131454207/tebikesop.pdf
    • http://aqueoushumour.ca/uploads/1/3/0/9/130969645/wagunu.pdf
    • http://whitneymlundy.com/uploads/1/3/0/8/130873807/d71286eb17cc1.pdf
    • http://theredheartproject.org/uploads/1/3/0/5/130550970/xiroze.pdf
    • http://cwcnaz.com/uploads/1/3/0/6/130621353/9516230.pdf
    • http://sinfullysabryna.com/uploads/1/3/0/5/130551187/4279670.pdf
    • http://handipapers.com/uploads/1/3/0/5/1305388
    • 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_off00008e34.bin
9caf7e97cceaa6031627bc31f78e3ad0108991cd1f09acdd31b2168cc82df21c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E34 10916 bytes
font_01_sfnt_off0000b25b.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 2652 bytes

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