Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9af37a56d424af…

MALICIOUS

PDF

53.3 KB Created: 2020-03-07 21:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da8d8e476cfdf4537ab804136f2fa28a SHA-1: adc78a01773ea4a5d18f96c25aae332851048518 SHA-256: 6e9af37a56d424af69f0f52ebfa45177dd4609184b0ba5526fa26094fe1a5786
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to attract users. The ML classifier strongly indicated maliciousness, and the presence of a "download button" heuristic further supports a malicious intent to trick users into downloading further content. The document body itself is heavily obfuscated and contains what appears to be junk data and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://x0418438xstreamtravel.xsideas.com/uploads/1/3/0/2/130288565/130288565.html#nursing+diagnosis+of+anemia+in+pregnancy
    • http://metalgiftideasandmor.com/uploads/1/3/0/8/130814673/0a4ea8.pdf
    • http://prominentbuildersllc.net/uploads/1/3/1/0/131070456/6353802.pdf
    • http://gagesblog.com/uploads/1/3/0/6/130603969/2183d73139c00c1.pdf
    • http://mcotc.com/uploads/1/3/0/5/130589252/zegixekufuj-neruzunin-janodepakobev.pdf
    • http://lorimedik.com/uploads/1/3/0/8/130814907/tojiwidog_kekevubukigobej.pdf
    • http://villasdiamante.com.mx/uploads/1/3/0/6/130621114/d827ceae.pdf
    • http://www.kevinapabst.com/uploads/1/3/0/3/130379063/zebulot.pdf
    • http://corpsaccess.org/uploads/1/3/0/7/130740082/xoziko.pdf
    • http://diamondbabygems.com/uploads/1/3/0/5/130538956/girupen-nididugefese-laraj-wufulotifikemud.pdf
    • http://mentok.net/uploads/1/3/0/4/130489350/gogikerinuvunezapa.pdf
    • http://aquinasenglish.com/uploads/1/3/0/3/130313314/5fdf49801d84.pdf
    • http://amicoffeecompany.com/uploads/1/3/0/7/130776063/zubalaka-ruwurezadenuj.pdf
    • http://pvpconstruction.net/uploads/1/3/0/6/130604191/pikuzofam.pdf
    • http://mail.mallonhomes.com/uploads/1/3/0/7/130739814/lagezetoligimofu.pdf
    • http://lottomagico.com/uploads/1/3/0/5/130551794/860395.pdf
    • http://dianapop.es/uploads/1/3/0/7/130775892/1598085.pdf
    • http://pereraholdings.com/uploads/1/3/0/6/130621149/miwipejowugewin.pdf
    • http://bluequestconsulting.com/uploads/1/3/0/6/130640146/xinuparelevekugija.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_off0000a692.bin
053e65c59c1e8477ad245643b274f611447ec8f5c0a453ab93ee54f21e52dbe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA692 8556 bytes

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