Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4979ec23ee9c940…

MALICIOUS

PDF

53.2 KB Created: 2020-03-29 06:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f76644ae576f0019d06161b82c3a0e1c SHA-1: b4e7a51a735ebc90fe0c96f683a538566ba767f3 SHA-256: a4979ec23ee9c9404cbeeabc6270ae566e9cfebc300d3878368947def98775e3
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to the Cold War and references to the URLs, suggesting a potential lure or distraction. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent to redirect the user to potentially harmful content.

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://estudio-thuban.com/uploads/1/3/0/6/130621656/130621656.html#el+triunfo+del+bloque+capitalista+en+la+guerra+fria
    • http://mingocarelabs.com/uploads/1/3/0/6/130620293/zamewujubagujasig.pdf
    • http://stsilouans.org/uploads/1/3/0/6/130639442/46a412ac6617.pdf
    • http://nashvilledrones.com/uploads/1/3/0/6/130621209/2946600.pdf
    • http://inspechomeinspection.org/uploads/1/3/0/4/130490584/0a993.pdf
    • http://byblair.co/uploads/1/3/0/6/130621483/zuvovedadagegem_putelaxenu.pdf
    • http://anchoredbydesign.net/uploads/1/3/0/4/130489082/4ecd54f5cf97.pdf
    • http://retrovideogamez.com/uploads/1/3/0/3/130313400/7804320.pdf
    • http://mytravel.guide/uploads/1/3/0/7/130740427/lopufomujavotozasovu.pdf
    • http://brandinfrancis.com/uploads/1/3/0/9/130969173/dakukizemiwij.pdf
    • http://themindtrainerhypnosis.com/uploads/1/3/0/5/130588564/vezekebobetut.pdf
    • http://nbcfutah.org/uploads/1/3/0/6/130603749/ba7a61d5eba26.pdf
    • http://www.angelicwisdom.org/uploads/1/3/0/5/130589427/8067747.pdf
    • http://www.sentriesgroup.nl/uploads/1/3/0/7/130774990/5883326.pdf
    • http://bitsbridlesbrambles.com/uploads/1/3/0/6/130605143/df684e3.pdf
    • http://embassyif.org/uploads/1/3/0/2/130288589/c5c6758.pdf
    • http://www.hendersonvetclinic.com/uploads/1/3/0/4/130488734/xazunarapifem-lurer-fuwojub.pdf
    • http://expertsforall.com/uploads/1/3/0/9/130969905/0a9d34ec82.pdf
    • http://sensibleshock.com/uploads/1/3/0/7/130740127/favulemez_jedefago.pdf
    • http://www.lydiahavens.com/uploads/1/3/0/6/130640084/7754944.pdf
    • http://weirdgotweirder.com/uploads/1/3/0/5/130541064/6764296fafb.pdf
    • http://www.accminlao.com/uploads/1/3/0/7/130776225/37e8fd38a03fa7.pdf
    • http://dieporzellanklinik.de/uploads/1/3/0/5/130551369/kalisim_kusufumavajumid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084fb.bin
0042b616a28cb72a666ae59142c278964a6f5196ff82d59889822a5fee9bc1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FB 9152 bytes
font_01_sfnt_off0000a605.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA605 2652 bytes
font_02_sfnt_off0000af6c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 16036 bytes

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