Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fe58da64fb1aa0…

MALICIOUS

PDF

130.6 KB Created: 2020-06-10 06:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1036320b26204d5c95938312ca37c023 SHA-1: 972002a0570c2b505233341f3fc71500aee3140c SHA-256: b9fe58da64fb1aa0a32a8d26e5186ff2241d1e86c62c61739dd9e430ad91326a
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary link points to http://74-123-78-125.mgwnet.com/uploads/1/3/0/3/130379675/130379675.html, which is likely part of a lure to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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://74-123-78-125.mgwnet.com/uploads/1/3/0/3/130379675/130379675.html#%25D9%2585%25D8%25A7%25D8%25B0%25D8%25A7+%25D9%258A%25D8%25B9%25D9%2586%25D9%258A+%25D8%25A8%25D8%25B1%25D8%25A7%25D9%2581%25D9%2588+%25D8%25B2%25D9%2588%25D9%2584%25D9%2588+%25D9%2581%25D9%258A+%25D8%25A7%25D9%2584%25D8%25A8%25D8%25AD%25D8%25B1%25D9%258A%25D8%25A9
    • http://rocksinthebox.com/uploads/1/3/1/1/131164393/3122678.pdf
    • http://voicesbydcon.com/uploads/1/3/0/8/130874021/02cd25.pdf
    • http://jahardwoodfloors.org/uploads/1/3/0/6/130621717/pawozesorokika.pdf
    • http://birthelearning.com/uploads/1/3/0/6/130604720/namivibijej.pdf
    • http://tubergoo.club/uploads/1/3/0/4/130488698/megipotam.pdf
    • http://cpcontacts.gompou.co.za/uploads/1/3/0/2/130270779/padiwonenow_vavoxizuwak_nenetidevuj.pdf
    • http://tripsthereandback.com/uploads/1/3/0/2/130272440/vulazi.pdf
    • http://ianosventures.com/uploads/1/3/0/4/130477775/8014926.pdf
    • http://mail.foxleelady.com/uploads/1/3/0/3/130379370/xusebaseleduvarigeg.pdf
    • http://manageyourlifebook.com/uploads/1/3/1/8/131856903/22d6918.pdf
    • http://mail.yourimmobile.de/uploads/1/3/0/6/130639546/pujovabezu.pdf
    • https://zedovase.files.wordpress.com/2020/06/19780373705.pdf
    • https://milinubed.files.wordpress.com/2020/06/paromegaguv.pdf
    • https://legebepome.files.wordpress.com/2020/06/98039572228.pdf
    • https://pirotevo.files.wordpress.com/2020/06/1261103208.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_003_off00019966.bin
a1b4f3635b2d30aedad44a14566460ede6266a4950917e82be980ec960556973
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19966 36276 bytes
font_01_sfnt_off0001d929.bin
ebb0c7a5a1b69c979be83003d74822893dea75efc0715ba9ece7b98c2e5e363b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D929 10716 bytes