Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c71018de16482…

MALICIOUS

PDF

44.3 KB Created: 2020-03-17 19:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 51e4f37b97585ad75a9c5d9d25556bd2 SHA-1: a5858190bc6d41a750fdcc2261d262d539896651 SHA-256: 684c71018de16482c5e07a813bdc4857bbe763c5be5bc9445706c1977fe85134
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were extracted, the document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent.

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://wwwdaimondholiday.com/uploads/1/3/0/8/130873876/130873876.html#precio+muebles+colgantes+para+oficina
    • http://www.donovanhendrick.com/uploads/1/3/0/6/130621392/vejoxeg-pijepotonob-vototigowulora-jevejifitu.pdf
    • http://turnberrypress.com/uploads/1/3/0/4/130483300/1171840.pdf
    • http://mail.bigredtruckdigital.com/uploads/1/3/0/2/130287976/2990516.pdf
    • http://taboozeshow.com/uploads/1/3/0/3/130313144/mufokapopa_ratobivopokip_maxotupif.pdf
    • http://mindbodymend.com.au/uploads/1/3/1/0/131070806/webapotaxane.pdf
    • http://mail.nehaircarestudio.com/uploads/1/3/0/6/130604254/zekejorururilulisal.pdf
    • http://fancyfeatheredfarm.com/uploads/1/3/0/5/130590658/d380328605999.pdf
    • http://myguillermofloresuagro.net/uploads/1/3/0/7/130739346/semafunelites.pdf
    • http://www.doubleviewphysio.com.au/uploads/1/3/0/2/130273894/c3665c7.pdf
    • http://www.cymrhi.com/uploads/1/3/0/5/130544878/nusumeju.pdf
    • http://root.ilminstergospelhall.org.uk/uploads/1/3/0/5/130543366/8888195.pdf
    • http://dogfriendlyrentalsonsanibel.com/uploads/1/3/0/8/130814169/d770d.pdf
    • http://tomasharanphoto.com/uploads/1/3/0/6/130620684/bipatipad-disido.pdf
    • http://michkah.com/uploads/1/3/0/7/130739122/suzopelabumuju_gozanamunikuw.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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000756d.bin
162c536a3e1c487ab29681f3323b834a7842d66167b914a4ce29da908fb0f4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 9212 bytes
font_01_sfnt_off0000968c.bin
eaa4dde51fd04d4db8dc223d97e5e1aeb2070941b7c144db1acc557f645d9ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968C 4184 bytes

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