Malicious PDF — malware analysis report

Static analysis result for SHA-256 29810ab89a039e7c…

MALICIOUS

PDF

40.9 KB Created: 2020-03-16 09:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14c8fe890d7ac1b8a6f135c0e5f7f1ec SHA-1: 0920b011e88bd88e994e68f57d0dbcfd5771a534 SHA-256: 29810ab89a039e7c4b416af83707363a413cdeac7888038a91165bf116f6b2d9
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are structured as SEO-optimized PDF files, indicating a link farm or redirection mechanism. The document body, though partially corrupted, mentions 'Berekum college of education admission forms', suggesting a lure to trick users into clicking on these links. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://bwsinvestments.com/uploads/1/3/0/8/130813429/130813429.html#berekum+college+of+education+admission+forms
    • http://seraphsnightmare.com/uploads/1/3/0/3/130313145/7517e4ee5b4fb.pdf
    • http://mail.boxsetrecords.com/uploads/1/3/0/6/130604687/9adf1dab7e.pdf
    • http://janinakrepart.com/uploads/1/3/0/5/130550774/mimikupisigexub_zixajafifu_ragigi_jejeguneroxu.pdf
    • http://slpresource.com/uploads/1/3/0/8/130815664/8b18c3aaf3.pdf
    • http://divinechild1969.com/uploads/1/3/0/6/130621096/6153794.pdf
    • http://codebeforedawn.net/uploads/1/3/0/4/130489072/pabozuwelabasuma.pdf
    • http://kristynlanggundlach.com/uploads/1/3/0/5/130590400/kadibiza-xamiverok-vojowim.pdf
    • http://www.melaniedietrich.com/uploads/1/3/0/5/130588334/kiramizizubibusino.pdf
    • http://ukpipefittingservicesltd.com/uploads/1/3/0/5/130544446/kebopigivoka.pdf
    • http://testanxiety.net/uploads/1/3/0/9/130969967/nivodunelagamif.pdf
    • http://www.ejernd.com/uploads/1/3/0/5/130551554/9283247.pdf
    • http://attorneymediationgroup.com/uploads/1/3/0/6/130621355/8573820.pdf
    • http://iclasse.com/uploads/1/3/0/9/130969933/penipudasunimazeb.pdf
    • http://crowdrising-success.com/uploads/1/3/0/2/130272936/xogajij-solefigako-zajevigefuzivo.pdf
    • http://www.kangenwaterdaily.com/uploads/1/3/0/3/130324289/wobot_juzerusow_lodojevovosanut_fekerizezis.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_off000076d2.bin
2e3071bd9ee5ae68a25b00dfd976ad9f330c99b9885c995f41399c3735a3535e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D2 8116 bytes

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