Malicious PDF — malware analysis report

Static analysis result for SHA-256 041d7366b573c2f4…

MALICIOUS

PDF

40.7 KB Created: 2020-04-12 12:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32c09d767e59b6cde93226f21051ea34 SHA-1: e468a4ea70e1714be80bee56976c5de6100bd891 SHA-256: 041d7366b573c2f488e1226399cddff157de310617354e369dbf3c7e13eb1bd1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, indicative of a link farm. One embedded URL, 'http://montanapurewood.com/uploads/1/3/1/3/131381471/131381471.html#do+while+do+until+difference+vba', suggests a potential attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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://montanapurewood.com/uploads/1/3/1/3/131381471/131381471.html#do+while+do+until+difference+vba
    • http://linwoodstaffing.com/uploads/1/3/0/8/130813111/gitowugobonesopot.pdf
    • http://simplyenhancingbeautylounge.com/uploads/1/3/0/2/130274349/4ecc7a7047100.pdf
    • http://infinitegoddess11.com/uploads/1/3/0/2/130289400/173512.pdf
    • http://yellowgroup2.com/uploads/1/3/0/5/130588693/zaxefadebu.pdf
    • http://wow-flower.com/uploads/1/3/0/6/130639270/4017203.pdf
    • http://thicklinefishing.com/uploads/1/3/0/8/130874519/ruwoni.pdf
    • http://teampartytime.com/uploads/1/3/0/7/130776823/22dcfa.pdf
    • http://cathysathletes.net/uploads/1/3/0/7/130775782/3429049.pdf
    • http://dbqualitysolutions.com/uploads/1/3/0/2/130291696/bazikatotu.pdf
    • http://coutureeatz.com/uploads/1/3/0/5/130588444/31689f31af8.pdf
    • http://stjohnslutheranchurchjenison.org/uploads/1/3/1/4/131408117/db2e051a0de02.pdf
    • http://kathyscreationsnc.com/uploads/1/3/0/7/130776823/wilikijujix.pdf
    • http://lottiegreenhowsoprano.com/uploads/1/3/0/6/130605001/terata-nuvoloniniwu-gelokovumoza-wopezoviva.pdf
    • http://nehalembeehive.com/uploads/1/3/0/7/130775742/44bf86fc91ceb.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_off00007556.bin
9536a25360b3cc086f94cc8762103eb1b367b03c7ca80e878e8470b90f4af9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7556 8620 bytes

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