Malicious PDF — malware analysis report

Static analysis result for SHA-256 70215b5b0c28c17a…

MALICIOUS

PDF

65.2 KB Created: 2020-04-17 23:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17f4c7420349d064fec8603a4fe14f0a SHA-1: 747344652d4b310345b915a55938f91c9b7e4471 SHA-256: 70215b5b0c28c17a5ccee9bde793683dfa0fa135baec97077d809f39640e2c62
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, identified as a link farm, suggesting a phishing or redirection attempt. The document body, though partially corrupted, includes text related to university admissions, serving as a lure. The ML classifier strongly indicates maliciousness, and the presence of many external links points towards a tactic of overwhelming the user with choices, likely leading to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reliant-group.us/uploads/1/3/0/6/130604307/130604307.html#delhi+university+law+admission+form+2019
    • http://yahshomestead.com/uploads/1/3/0/9/130969774/wodonagibidi-nuxorixomixuj.pdf
    • http://409parkviewway.com/uploads/1/3/0/7/130740163/suxanaxataru_mazerinokivulaw_sipibat.pdf
    • http://wallingfordwood.com/uploads/1/3/0/4/130488542/zotebineberarakigi.pdf
    • http://amfloralshop.com/uploads/1/3/1/4/131483036/luniwu.pdf
    • http://kathysweeney.com/uploads/1/3/1/3/131382721/2500774.pdf
    • http://icodethefuture.com/uploads/1/3/0/9/130969306/a99dc963378.pdf
    • http://ardingtonschoolofcrafts.com/uploads/1/3/0/4/130435939/sabusiwudirisu.pdf
    • http://rechtspraak-republieknl-aarde.space/uploads/1/3/0/5/130547078/xikatuxuzageniwal.pdf
    • http://yogapsychologycentre.com/uploads/1/3/0/7/130740049/liputapitafesafod.pdf
    • http://memoriesandvisions.com/uploads/1/3/0/2/130288320/1499143.pdf
    • http://nadinecooke.com/uploads/1/3/1/4/131454238/cea42777a70a1.pdf
    • http://fitzsdresses.com/uploads/1/3/0/6/130620395/250934.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d7a.bin
d236197d3cd227ff1d4ca41b1a5937b9eb34f73c1b0ec900f02ccfcc7ba103b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7A 8728 bytes
font_01_sfnt_off0000beb0.bin
236d54f3e2479d5e72da3d1be4616617e509581c3e9108e812f40a19f40d28ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 2228 bytes
font_02_sfnt_off0000c8cf.bin
da097a8c459adbfdf1b1d97412e41569b305acf822c6e113ff3e46e38a168572		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 16224 bytes
font_03_sfnt_off0000de19.bin
4a63abeb5b74b1ec0e958667050fa25ade79ba65946fb301a829a0a7369b96cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 8896 bytes

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