Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ac8b875d585a17…

MALICIOUS

PDF

78.5 KB Created: 2020-06-04 00:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c946d62ea79425c5f0f20ee50f06a465 SHA-1: ea291f9b0675634f7e149e21f502001ec11ecc5f SHA-256: d1ac8b875d585a175c6616f3919247be04e58683b32f84a682f51bfb44e439ff
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains text related to 'technical analysis of the financial' and the authoring application 'wkhtmltopdf', indicating a potential lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown reputation URLs supports a malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bodiesbybeth.net/uploads/1/3/0/3/130323255/130323255.html#technical+analysis+of+the+financial
    • http://curvybridesma.com/uploads/1/3/0/6/130620996/1572a.pdf
    • http://losgatosswingband.com/uploads/1/3/0/7/130776368/8477062.pdf
    • http://demainsaintandre.com/uploads/1/3/0/6/130605237/xuxupi.pdf
    • http://americanrailroadsignal.com/uploads/1/3/1/8/131857723/zavefu.pdf
    • http://dtoponline.com/uploads/1/3/0/6/130639998/72c479b016e2.pdf
    • http://meaghanbparent.com/uploads/1/3/0/5/130588693/2bec437dbd52.pdf
    • http://1healthsource.net/uploads/1/3/0/9/130969624/molezo_gulat_gepigutagetog.pdf
    • http://mail.chrisfoxrealtor.com/uploads/1/3/0/6/130604805/witapaxatokegolo.pdf
    • http://partridgepropertymaintenance.com/uploads/1/3/0/6/130604951/ziwonobudu.pdf
    • http://askbrotherjake.com/uploads/1/3/0/5/130540405/bawasidaka.pdf
    • http://lifewaysforliving.com/uploads/1/3/0/6/130639145/fujilatuxid_tebisa_losoke_tizagun.pdf
    • http://3ok.undesirable.us/uploads/1/3/0/4/130488851/xixef_sanenovemalup_tupenozede_viwupelova.pdf
    • http://tenerifeapartmentrent.com/uploads/1/3/1/3/131398093/190214.pdf
    • http://webmail.linlithgowscdc.org/uploads/1/3/0/6/130639676/jobuninabebi_lorafodisajagik_wasitorojudij.pdf
    • http://bodiesbybeth.net/uploads/1/3/0/3/130323255/terms.html
    • http://bodiesbybeth.net/uploads/1/3/0/3/130323255/dmca.html
    • http://bodiesbybeth.net/uploads/1/3/0/3/130323255/policy.html
    • https://pegizibi.files.wordpress.com/2020/06/38890375030.pdf
    • https://wisetej.files.wordpress.com/2020/06/jixojulemof.pdf
    • https://mibirurojole.files.wordpress.com/2020/06/pofirerizevofow.pdf
    • https://vawofomije194917598.files.wordpress.com/2020/06/batexabifemawirobi.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_off00010825.bin
f0b5888c211bfe9c9a6fd9bc34f3fc91d38503c9b6ef4479469976c979798640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 11160 bytes

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