Malicious PDF — malware analysis report

Static analysis result for SHA-256 768a8ca58d9ae26d…

MALICIOUS

PDF

52.9 KB Created: 2020-04-03 03:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 05c74c94f795757b1ee8ff551565ac1a SHA-1: 1034fe8b45a7e8775a139b0cabe8009e39701c04 SHA-256: 768a8ca58d9ae26d51d29c57c961722928724bd847b078fe3559913c2dd9813b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm for SEO manipulation or to host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were explicitly extracted, the ML classifier and the presence of numerous external links strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://craniosacralnashville.com/uploads/1/3/0/7/130739476/130739476.html#ms+access+objective+questions+and+answers+in+english+pdf
    • http://freexperience.net/uploads/1/3/0/5/130550955/cb2736ded5.pdf
    • http://reussirsoninsertion.org/uploads/1/3/0/6/130639337/4ce3b5.pdf
    • http://bespokemantels.com/uploads/1/3/0/9/130969052/9884666.pdf
    • http://droletconstruction.net/uploads/1/3/0/6/130621412/162d3f7eab.pdf
    • http://valerieetguillaume.com/uploads/1/3/0/4/130476511/vumemulizoza.pdf
    • http://dankerie.org/uploads/1/3/0/5/130551429/4f688878ed8fdf9.pdf
    • http://kuumbaschool.org/uploads/1/3/0/3/130379342/mofapoludumaboj.pdf
    • http://rowdygainesmastersclassic.com/uploads/1/3/0/2/130289733/981ec16c.pdf
    • http://im1nsured.com/uploads/1/3/0/9/130968973/a19d6.pdf
    • http://splithoofoutfitters.net/uploads/1/3/0/7/130776407/6541500.pdf
    • http://jensonlawnservice.com/uploads/1/3/0/4/130488513/6673142.pdf
    • http://andreserpoosh.com/uploads/1/3/0/5/130551287/1864536.pdf
    • http://seriedelcaribepr.com/uploads/1/3/0/3/130313466/3841386.pdf
    • http://tcyflbears.com/uploads/1/3/0/8/130813141/sedogipasiga.pdf
    • http://akpartnership.org/uploads/1/3/1/4/131410597/jowimivagora.pdf
    • http://thebikebroker.com/uploads/1/3/0/7/130776159/c1b207faa935610.pdf
    • http://www.stlatamembers.com/uploads/1/3/0/7/130775167/c097877dce5b305.pdf
    • http://bouldercreekmeadows.com/uploads/1/3/0/7/130740625/dibaluw.pdf
    • http://rogerweiss.info/uploads/1/3/0/5/130540219/lenupakiximosevaniz.pdf
    • http://erielimoservices.com/uploads/1/3/0/7/130739220/970a5d51e9dea8.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_off0000a6df.bin
7075eda9442a56a29e56d3260a595d30e1129b901296337e66c024d4f4e9e7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6DF 7792 bytes

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