Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f78d2c5979339c…

MALICIOUS

PDF

87.4 KB Created: 2020-06-06 09:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0844dc8a781fbcd1bbd480c02d8db6e5 SHA-1: 0a20fecdd39ab45d9bba58f849094fc13941c978 SHA-256: 30f78d2c5979339ccf51c6450ffc6680de64eaece932e36446d8c59154b8699a
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous external URLs, with the primary heuristic identifying a mass external PDF link farm. The document body is heavily obfuscated and appears to contain embedded URLs, suggesting a lure to external malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lunartouchreiki.com/uploads/1/3/1/0/131070213/131070213.html#%25D9%2585%25D8%25AC%25D9%2584%25D8%25A7%25D8%25AA+%25D8%25AC%25D9%2586%25D8%25B3%25D9%258A%25D8%25A9+%25D9%2585%25D8%25AC%25D8%25A7%25D9%2586%25D9%258A%25D9%2587
    • http://mta-sts.redroselandscaping.com/uploads/1/3/0/5/130545745/jumegefizig-xupon-pagiloja.pdf
    • http://haargalerie.eu/uploads/1/3/0/6/130639690/tedeluwolenoso.pdf
    • http://mail.muabantoc.vn/uploads/1/3/0/9/130969191/2337685.pdf
    • http://yoga4kids.nl/uploads/1/3/0/2/130273845/83aa9d.pdf
    • http://mmb.nyc/uploads/1/3/0/2/130272976/gelobofexu.pdf
    • http://webdisk.cawsab.org/uploads/1/3/0/6/130603954/be11fb1d8428.pdf
    • http://huntingtonbeachrealestatephotography.com/uploads/1/3/0/8/130874123/lalafoletamopilo.pdf
    • http://antivirus.parkroadbaptistcdc.org/uploads/1/3/0/7/130775619/b243a6406.pdf
    • http://lunartouchreiki.com/uploads/1/3/1/0/131070213/terms.html
    • http://lunartouchreiki.com/uploads/1/3/1/0/131070213/dmca.html
    • http://lunartouchreiki.com/uploads/1/3/1/0/131070213/policy.html
    • https://wumexupe.files.wordpress.com/2020/06/34938563403.pdf
    • https://seximapakoro.files.wordpress.com/2020/06/88271863113.pdf
    • https://luvipif.files.wordpress.com/2020/06/23873971939.pdf
    • https://jofoxuvi68340568.files.wordpress.com/2020/06/sevasivebikapikubirona.pdf
    • https://tarunigufoza.files.wordpress.com/2020/06/devozosapabesomevofiz.pdf
    • https://kopokugol.files.wordpress.com/2020/06/52566866789.pdf
    • https://vurijaniw46832415.files.wordpress.com/2020/06/fofetozisu.pdf
    • https://pukidolaza.files.wordpress.com/2020/06/50952987604.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
stream_004_off000116c4.bin
ed7a8d4c51e3dd3788e7f823b83e7ceeae60520d7619ec4d91215c3518d948a9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116C4 32964 bytes
font_00_sfnt_off0000f5e1.bin
54f0baa0a97901fbec3af7bdd7c0947dfc9fe9d4385e59c7aab02b392898164e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 9496 bytes