Malicious PDF — malware analysis report

Static analysis result for SHA-256 762f830cbd0ee499…

MALICIOUS

PDF

53.4 KB Created: 2020-03-21 13:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5de718fe1fb626124a6278bf9519ef1e SHA-1: d8a2d11de1dce0c339f99b26bdd02edfc8390e09 SHA-256: 762f830cbd0ee499aabc71f3b64f91343f344f70634d13e9c5c18857f534da5a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, identified as a link farm, and is classified as malicious by an ML model. The document body, though partially obfuscated, suggests a lure related to academic writing, directing users to a specific URL. The presence of many similar URLs across different domains indicates a coordinated effort to drive traffic, likely for malicious purposes such as phishing or malware distribution.

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://befreetherapy.com/uploads/1/3/0/3/130313038/130313038.html#how+to+write+a+synthesis+essay+ap+language+and+composition
    • http://elizashearts4haiti.org/uploads/1/3/0/5/130539131/wasidemalasawugu.pdf
    • http://apinavigator.com/uploads/1/3/0/6/130620981/kumives-dowel.pdf
    • http://alniyatbellydance.com/uploads/1/3/0/7/130740563/rufenokadem_vadejif.pdf
    • http://bosbees.com/uploads/1/3/0/7/130739398/ea84b7947ae2e4.pdf
    • http://autointeriorgroup.com/uploads/1/3/0/3/130323212/167298c.pdf
    • http://jsembroidery.org/uploads/1/3/0/3/130323374/5394392.pdf
    • http://www.schmitz-seasonal-services.com/uploads/1/3/0/7/130776727/kosotutakurojeweje.pdf
    • http://mindtoys.net/uploads/1/3/0/5/130541424/46ba6eaf9.pdf
    • http://www.qb-makeup.com/uploads/1/3/0/8/130874119/kadik.pdf
    • http://communicationcasesrobina.com/uploads/1/3/0/5/130550749/fuvez.pdf
    • http://lovellaweddings.net/uploads/1/3/0/5/130588403/7064102.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000939a.bin
46b3a27de9beffa28d42a2e208c6958639e5628323ffb3f1e50a5dc29da609ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939A 8196 bytes
font_01_sfnt_off0000b339.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB339 16036 bytes

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