Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a4551f9202cd8d…

MALICIOUS

PDF

56.2 KB Created: 2020-04-04 07:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec7ec05770696c7ac653e29ad4e63dcd SHA-1: ff5f9fd0731dc2d6cd605363379c2072eac76aaa SHA-256: 24a4551f9202cd8da4b64d554c3994a8334fac4cae6f8bbd754f1afb8271addb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which is a common technique for SEO spam or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains a mix of obfuscated text and URLs, including 'http://rapidpermitreviewhawaii.com/uploads/1/3/0/3/130323593/130323593.html#descargar+musica+cristiana+gratis+2018', suggesting a lure to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://rapidpermitreviewhawaii.com/uploads/1/3/0/3/130323593/130323593.html#descargar+musica+cristiana+gratis+2018
    • http://shopskincarensc.com/uploads/1/3/0/6/130604618/e12dee82.pdf
    • http://myturnsale.com/uploads/1/3/0/7/130738625/7877584.pdf
    • http://thenakedchurch.com/uploads/1/3/0/4/130483540/d10ea5e25.pdf
    • http://studyabroaddominicanrepoublicspanish101wvu.com/uploads/1/3/0/5/130589151/10dfa2.pdf
    • http://clanbrown.ca/uploads/1/3/0/6/130621901/2c82dbcb.pdf
    • http://myexposolutions.com/uploads/1/3/0/4/130476242/jobimakomigej_kukelumigejoke.pdf
    • http://littlebigshotsstables.com/uploads/1/3/1/0/131070382/xijovevetifova.pdf
    • http://smashvb.com/uploads/1/3/0/4/130435685/9049725.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000098c4.bin
8b4ce10cd542de70bfd5b0240ce00c2b66a1972142484b510b64550d7b6ed212		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x98C4 8180 bytes
font_00_sfnt_off0000670f.bin
efe41cb4757344bda3dd1affbfa1d1fc6d539c0708bc1541b179df59fdef8392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670F 6412 bytes
font_01_sfnt_off000076a2.bin
6eb7f5b8c11511dbcc1d8b61104a64d7c8db4ddd7a1932fc2e379461cf09c25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A2 9396 bytes
font_03_sfnt_off0000b2cf.bin
a609ba90d4f899e6ee1e351df3a2e624f8357689cb5622bc6b33b42fcc6b0773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 1568 bytes
font_04_sfnt_off0000bacf.bin
7632c1e750bb6e565e21ae67c25448dfa540968eacf8732a7b43a790a220e964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 16344 bytes

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