Malicious PDF — malware analysis report

Static analysis result for SHA-256 227b8362b3134639…

MALICIOUS

PDF

43.1 KB Created: 2020-03-26 08:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: daaac74bcdfcfd59fe21bb0a5b9d6a49 SHA-1: 985f041659b7b44a111181af414b2dc10edf70f1 SHA-256: 227b8362b313463966f03e3b26ff574ba022f3ac8c32f22ce218599a143e63f5
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains a large number of external links, many pointing to PDF files on various domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs are likely used to redirect users to malicious sites or to distribute further malware. No scripts were extracted from this sample.

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://deceptivelysimple.com/uploads/1/3/0/7/130738623/130738623.html#nombre+de+flor+o+fruto+con+o
    • http://aristobule.com/uploads/1/3/1/0/131069997/8156852.pdf
    • http://confirmdetailsspotify.com/uploads/1/3/0/6/130639746/fa2e9463089.pdf
    • http://eastdhuriver.com/uploads/1/3/0/4/130476294/munijiwosawedo-lobewajexomuze-xikenurede.pdf
    • http://charlottewildlife.org/uploads/1/3/0/5/130539202/laratex.pdf
    • http://nenebrad.com/uploads/1/3/0/2/130273625/kajam.pdf
    • http://vegascashflows.com/uploads/1/3/0/4/130483626/gorabexa.pdf
    • http://lenburg.net/uploads/1/3/0/6/130639147/nikovaz-gukotuzarafedo-mifesuzunamur.pdf
    • http://bricdesign.com/uploads/1/3/0/7/130775690/laxowiso.pdf
    • http://postfineartstudio.com/uploads/1/3/0/3/130313470/d9d14d32263.pdf
    • http://wordme.co/uploads/1/3/0/7/130740617/bigusanaxuvam.pdf
    • http://artgardencreative.com/uploads/1/3/0/6/130604154/1843824.pdf
    • http://leasehold-advice.co.uk/uploads/1/3/0/9/130969470/toxofipagixorolan.pdf
    • http://www.virtuouscurvesboutique1.com/uploads/1/3/0/8/130873796/muwegim_lafoforulada.pdf
    • http://www.bridginghand.org/uploads/1/3/0/6/130622023/6437e1cff09.pdf
    • http://www.thehappyhaircompany.com/uploads/1/3/0/8/130814430/mifinofivitofona.pdf
    • http://cambridgeblackcar.com/uploads/1/3/0/2/130289371/4350340.pdf
    • http://augustahousekeeping.com/uploads/1/3/0/6/130603819/natama_galuvuwoxaxaso_tepigalob.pdf
    • http://infinitelyfairfaces.com/uploads/1/3/0/5/130589317/5209082.pdf
    • http://atasindustries7.com/uploads/1/3/0/6/130605273/vedejasefimi_teladid_vesiz_powazasaxu.pdf
    • http://puppysquares.com/uploads/1/3/0/7/130739895/tuletebamim.pdf
    • http://winnicki.pl/uploads/1/3/0/2/130287929/1e17e614.pdf
    • http://mountaintechnicalsolutions.com/uploads/1/3/0/5/130539048/7ac283d3d.pdf
    • http://ngsprephoops.com/uploads/1/3/0/6/130639803/2544254.pdf
    • http://albanese.org/uploads/1/3/0/6/130639331/seronog.pdf
    • http://albanese.org/uploads/1/3/0/6/13
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007558.bin
cc0f812c25383022702536ac28641e01a6fadc865224104b8dc78155fd30a915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7558 8696 bytes
font_01_sfnt_off0000950c.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x950C 2616 bytes

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