Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f54b176bd86d8e…

MALICIOUS

PDF

49.5 KB Created: 2020-04-02 08:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-10
MD5: e1884534573fa342cbe41aef331fb25b SHA-1: 5ce1cdb61f8dc91e170b2ce94f57432c4a1d1b86 SHA-256: f7f54b176bd86d8e4706fd817a5718b071b586d455fc370a1b15d59fd7e4a384
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of linked PDFs hosted on various domains, likely to obscure the ultimate malicious destination or to spread traffic.

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://welldarn.com/uploads/1/3/0/4/130475923/130475923.html#cromatografia+liquida+de+alta+resolucion+que+es PDF link annotation
    • http://battenkilldoula.com/uploads/1/3/0/5/130589156/495650.pdfIn PDF document text
    • http://threadzinmotion.com/uploads/1/3/0/3/130313440/1390601.pdfIn PDF document text
    • http://theveganpulse.com/uploads/1/3/0/9/130969172/8298042.pdfIn PDF document text
    • http://royalhealthinc.com/uploads/1/3/0/2/130270980/nasupilizaxofu.pdfIn PDF document text
    • http://midsussexmusiclessons.com/uploads/1/3/1/4/131437930/boxinup.pdfIn PDF document text
    • http://mercierlawllc.com/uploads/1/3/0/6/130639082/9618296.pdfIn PDF document text
    • http://priscillaariana.com/uploads/1/3/0/5/130542736/tovusak.pdfIn PDF document text
    • http://shardexplorers.com/uploads/1/3/0/5/130540897/jitawe.pdfIn PDF document text
    • http://michellesgym.com/uploads/1/3/0/6/130620923/zajafimasoweb.pdfIn PDF document text
    • http://agilityincorporated.com/uploads/1/3/1/4/131406817/5190978.pdfIn PDF document text
    • http://clarkcgroup.com/uploads/1/3/0/7/130776790/1437880.pdfIn PDF document text
    • http://wellnessinthewoods-wi.com/uploads/1/3/1/3/131379525/wagiri-fikun-puvajuvupob-zoludoji.pdfIn PDF document text
    • http://alexiosai.com/uploads/1/3/0/5/130588751/sisikaseteva_tunaxogola_daredumepi_xoruvajel.pdfIn PDF document text
    • http://tiaraarts.com/uploads/1/3/0/3/130313006/bisowijiva.pdfIn PDF document text
    • http://dinoscoresheet.com/uploads/1/3/1/3/131381045/05e54c4180c.pdfIn PDF document text
    • http://binnenstedelijkbouwen.com/uploads/1/3/1/0/131069921/be51d0c.pdfIn PDF document text
    • http://sweetsbysamie.com/uploads/1/3/0/6/130620804/104080.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078ac.bin
3ac792bf44f0dba6a21ff1338d6396535a845b0b4ef2523526103909788b75f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AC 8604 bytes
font_01_sfnt_off000097e3.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E3 2616 bytes
font_02_sfnt_off0000a117.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA117 16036 bytes

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