Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4e85e37d99b0c7…

MALICIOUS

PDF

38.4 KB Created: 2020-03-29 21:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cfe2bfa0a5daf66c29cb6d32d3c08e0b SHA-1: f015f4bbaaad2f7796361a04a22686820bed1589 SHA-256: 4d4e85e37d99b0c79f1c056322f8fd16129ff8ff7d4fb36a445986a646948b9b
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text, while partially obfuscated, includes a URL that appears to be a lure. This behavior is characteristic of a link farm or a campaign distributing malicious content through a network of compromised websites. The ML classifier strongly indicated maliciousness.

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://lennoxweb.com/uploads/1/3/0/6/130604552/130604552.html#tipos+de+placas+de+carros+el+salvador
    • http://skipstonelearning.com/uploads/1/3/0/5/130539455/2192368.pdf
    • http://pluckmusicagency.com/uploads/1/3/0/5/130589006/jinosej.pdf
    • http://joannekakatymonzo.com/uploads/1/3/1/1/131164419/jijeguwavebenalisew.pdf
    • http://lhmemorialfund.com/uploads/1/3/0/9/130969897/dumijodexu.pdf
    • http://juicing4us.com/uploads/1/3/0/5/130590689/favajabajotizaw.pdf
    • http://zobleu.com/uploads/1/3/0/3/130379386/5744802.pdf
    • http://showbizarre.in/uploads/1/3/0/4/130489342/zixaxagozu.pdf
    • http://yourcommunityacupuncture.com/uploads/1/3/0/8/130874377/gifapagajuta_futason_fozixem.pdf
    • http://isladelplacer.com/uploads/1/3/0/2/130287878/525344.pdf
    • http://thechronicvet.com/uploads/1/3/0/2/130287243/negulixejig.pdf
    • http://hoerikwaggaguarding.com/uploads/1/3/0/2/130272081/6482229.pdf
    • http://reviewgaggifts.com/uploads/1/3/1/4/131408954/d8ba19ebb0.pdf
    • http://daughtersoflfaye.com/uploads/1/3/0/3/130379589/lanakebufemabir.pdf
    • http://issybooks.com/uploads/1/3/0/8/130874231/4993789.pdf
    • http://realappraisals.com/uploads/1/3/0/8/130874437/2115960.pdf
    • http://4elbowsonatable.com/uploads/1/3/0/6/130639270/6856d3121506.pdf
    • http://lesoizelles.ca/uploads/1/3/0/7/130739116/jofixaj.pdf
    • http://auradayspasalon.com/uploads/1/3/0/8/130813785/4927747.pdf
    • http://animatorfun.com/uploads/1/3/0/6/130604191/2336308c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ab1.bin
305f055357f11fe0d3fd1c2d5d71f1aea89b634461f123141c2e364ca07171b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB1 6768 bytes
font_01_sfnt_off00007479.bin
b4eaba1313c2ae02e0840532e8df49817f4492e706e7fc7006fa435ca033da2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 16208 bytes

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